{
  "title": "Properties of Whole Numbers - Grade 6 CBSE",
  "total_questions": 150,
  "questions": [
    {"id": 1, "difficulty": "easy", "question": "What is 5 + 0?", "options": {"A": "0", "B": "5", "C": "1", "D": "10"}, "correct_answer": "B"},
    {"id": 2, "difficulty": "easy", "question": "What is 7 × 1?", "options": {"A": "0", "B": "1", "C": "7", "D": "8"}, "correct_answer": "C"},
    {"id": 3, "difficulty": "easy", "question": "What is 9 + 3? Is it the same as 3 + 9?", "options": {"A": "12, Yes", "B": "12, No", "C": "11, Yes", "D": "11, No"}, "correct_answer": "A"},
    {"id": 4, "difficulty": "easy", "question": "What is 4 × 2? Is it the same as 2 × 4?", "options": {"A": "6, No", "B": "8, Yes", "C": "8, No", "D": "6, Yes"}, "correct_answer": "B"},
    {"id": 5, "difficulty": "easy", "question": "What is 6 + (2 + 3)? Is it same as (6 + 2) + 3?", "options": {"A": "10, No", "B": "11, Yes", "C": "11, No", "D": "10, Yes"}, "correct_answer": "B"},
    {"id": 6, "difficulty": "easy", "question": "What is 3 × (4 × 2)? Is it same as (3 × 4) × 2?", "options": {"A": "20, No", "B": "24, Yes", "C": "24, No", "D": "20, Yes"}, "correct_answer": "B"},
    {"id": 7, "difficulty": "easy", "question": "What is 8 × 0?", "options": {"A": "0", "B": "8", "C": "1", "D": "80"}, "correct_answer": "A"},
    {"id": 8, "difficulty": "easy", "question": "What is 15 + 0?", "options": {"A": "0", "B": "1", "C": "15", "D": "150"}, "correct_answer": "C"},
    {"id": 9, "difficulty": "easy", "question": "Does 5 + 2 = 2 + 5 demonstrate commutative property?", "options": {"A": "Yes", "B": "No", "C": "Sometimes", "D": "Never"}, "correct_answer": "A"},
    {"id": 10, "difficulty": "easy", "question": "What is 20 × 1?", "options": {"A": "0", "B": "1", "C": "20", "D": "21"}, "correct_answer": "C"},
    {"id": 11, "difficulty": "easy", "question": "Is 9 + 4 = 4 + 9 true?", "options": {"A": "Yes", "B": "No", "C": "Sometimes", "D": "Cannot say"}, "correct_answer": "A"},
    {"id": 12, "difficulty": "easy", "question": "What is 0 + 12?", "options": {"A": "0", "B": "12", "C": "1", "D": "120"}, "correct_answer": "B"},
    {"id": 13, "difficulty": "easy", "question": "Does 6 × 7 = 7 × 6?", "options": {"A": "Yes", "B": "No", "C": "Only for even numbers", "D": "Only for odd numbers"}, "correct_answer": "A"},
    {"id": 14, "difficulty": "easy", "question": "What is 25 × 0?", "options": {"A": "25", "B": "0", "C": "1", "D": "250"}, "correct_answer": "B"},
    {"id": 15, "difficulty": "easy", "question": "Is (3 + 5) + 2 = 3 + (5 + 2)?", "options": {"A": "Yes", "B": "No", "C": "Sometimes", "D": "Only for small numbers"}, "correct_answer": "A"},
    {"id": 16, "difficulty": "easy", "question": "What is 1 × 48?", "options": {"A": "0", "B": "1", "C": "48", "D": "49"}, "correct_answer": "C"},
    {"id": 17, "difficulty": "easy", "question": "Does 4 + 0 = 4 demonstrate additive identity?", "options": {"A": "Yes", "B": "No", "C": "Maybe", "D": "Only for 4"}, "correct_answer": "A"},
    {"id": 18, "difficulty": "easy", "question": "Is 8 × 3 = 3 × 8 an example of commutative property?", "options": {"A": "Yes", "B": "No", "C": "Only for multiplication", "D": "Only for addition"}, "correct_answer": "A"},
    {"id": 19, "difficulty": "easy", "question": "What is 0 × 100?", "options": {"A": "0", "B": "100", "C": "1", "D": "1000"}, "correct_answer": "A"},
    {"id": 20, "difficulty": "easy", "question": "Does 7 + (3 + 2) = (7 + 3) + 2?", "options": {"A": "Yes", "B": "No", "C": "Only when numbers are small", "D": "Only when numbers are large"}, "correct_answer": "A"},
    {"id": 21, "difficulty": "medium", "question": "Which property is shown: 15 + 20 = 20 + 15?", "options": {"A": "Associative", "B": "Commutative", "C": "Identity", "D": "Distributive"}, "correct_answer": "B"},
    {"id": 22, "difficulty": "medium", "question": "Which property is shown: 8 × (5 × 2) = (8 × 5) × 2?", "options": {"A": "Commutative", "B": "Associative", "C": "Identity", "D": "Distributive"}, "correct_answer": "B"},
    {"id": 23, "difficulty": "medium", "question": "What is the additive identity for whole numbers?", "options": {"A": "0", "B": "1", "C": "10", "D": "100"}, "correct_answer": "A"},
    {"id": 24, "difficulty": "medium", "question": "What is the multiplicative identity for whole numbers?", "options": {"A": "0", "B": "1", "C": "2", "D": "10"}, "correct_answer": "B"},
    {"id": 25, "difficulty": "medium", "question": "Which property says a + b = b + a?", "options": {"A": "Associative", "B": "Commutative", "C": "Identity", "D": "Distributive"}, "correct_answer": "B"},
    {"id": 26, "difficulty": "medium", "question": "Solve using distributive property: 4 × (5 + 3)", "options": {"A": "4×5 + 4×3 = 32", "B": "4×5 + 3 = 23", "C": "5×4 + 3×4 = 35", "D": "4+5 × 4+3 = 63"}, "correct_answer": "A"},
    {"id": 27, "difficulty": "medium", "question": "Which is NOT a property of whole numbers?", "options": {"A": "Commutative", "B": "Associative", "C": "Identity", "D": "Inverse"}, "correct_answer": "D"},
    {"id": 28, "difficulty": "medium", "question": "What is 25 × (4 × 8) using properties?", "options": {"A": "25×4 + 25×8 = 300", "B": "(25×4)×8 = 800", "C": "25×32 = 800", "D": "100×8 = 800"}, "correct_answer": "B"},
    {"id": 29, "difficulty": "medium", "question": "Which property: (12 + 8) + 5 = 12 + (8 + 5)?", "options": {"A": "Commutative", "B": "Associative", "C": "Identity", "D": "Distributive"}, "correct_answer": "B"},
    {"id": 30, "difficulty": "medium", "question": "What is 7 × 50 using distributive property?", "options": {"A": "7×50 = 350", "B": "7×40 + 7×10 = 350", "C": "5×70 = 350", "D": "7×5×10 = 350"}, "correct_answer": "B"},
    {"id": 31, "difficulty": "medium", "question": "Zero multiplied by any whole number gives:", "options": {"A": "The number itself", "B": "0", "C": "1", "D": "10"}, "correct_answer": "B"},
    {"id": 32, "difficulty": "medium", "question": "One multiplied by any whole number gives:", "options": {"A": "The number itself", "B": "0", "C": "1", "D": "Number + 1"}, "correct_answer": "A"},
    {"id": 33, "difficulty": "medium", "question": "Which property: 45 × 1 = 45?", "options": {"A": "Commutative", "B": "Associative", "C": "Multiplicative identity", "D": "Additive identity"}, "correct_answer": "C"},
    {"id": 34, "difficulty": "medium", "question": "Solve: 15 × (10 + 2) using distributive property", "options": {"A": "15×10 + 15×2 = 180", "B": "15×12 = 180", "C": "10×15 + 2×15 = 180", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 35, "difficulty": "medium", "question": "What is 125 × 8 × 4 using associative property?", "options": {"A": "125×(8×4) = 4000", "B": "(125×8)×4 = 4000", "C": "125×32 = 4000", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 36, "difficulty": "medium", "question": "Which property allows us to write 6×9 = 9×6?", "options": {"A": "Associative", "B": "Commutative", "C": "Distributive", "D": "Identity"}, "correct_answer": "B"},
    {"id": 37, "difficulty": "medium", "question": "What is 0 + 325?", "options": {"A": "0", "B": "325", "C": "1", "D": "3250"}, "correct_answer": "B"},
    {"id": 38, "difficulty": "medium", "question": "Find 25 × 48 using distributive property: 25 × (50 - 2)", "options": {"A": "25×50 - 25×2 = 1200", "B": "25×48 = 1200", "C": "25×50 + 25×2 = 1300", "D": "Both A and B"}, "correct_answer": "D"},
    {"id": 39, "difficulty": "medium", "question": "What property: (3 × 4) × 5 = 3 × (4 × 5)?", "options": {"A": "Commutative", "B": "Associative", "C": "Distributive", "D": "Identity"}, "correct_answer": "B"},
    {"id": 40, "difficulty": "medium", "question": "Zero added to any whole number gives:", "options": {"A": "0", "B": "1", "C": "The number itself", "D": "10"}, "correct_answer": "C"},
    {"id": 41, "difficulty": "medium", "question": "What is 99 × 7 using distributive property?", "options": {"A": "(100-1)×7 = 700-7 = 693", "B": "99×7 = 693", "C": "100×7 - 1×7 = 693", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 42, "difficulty": "medium", "question": "Which property says a × (b + c) = a×b + a×c?", "options": {"A": "Commutative", "B": "Associative", "C": "Distributive", "D": "Identity"}, "correct_answer": "C"},
    {"id": 43, "difficulty": "medium", "question": "What is 50 × 25 × 4 using properties?", "options": {"A": "50×(25×4) = 5000", "B": "(50×25)×4 = 5000", "C": "50×100 = 5000", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 44, "difficulty": "medium", "question": "Which is NOT true for whole numbers?", "options": {"A": "a+b = b+a", "B": "a×b = b×a", "C": "a-b = b-a", "D": "a+(b+c) = (a+b)+c"}, "correct_answer": "C"},
    {"id": 45, "difficulty": "medium", "question": "What is 8 × 125 using distributive property?", "options": {"A": "8×100 + 8×25 = 1000", "B": "(8×100)+(8×25) = 1000", "C": "8×125 = 1000", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 46, "difficulty": "medium", "question": "Which property: 17 + 0 = 17?", "options": {"A": "Commutative", "B": "Associative", "C": "Additive identity", "D": "Multiplicative identity"}, "correct_answer": "C"},
    {"id": 47, "difficulty": "medium", "question": "What is 150 × 0?", "options": {"A": "150", "B": "0", "C": "1", "D": "1500"}, "correct_answer": "B"},
    {"id": 48, "difficulty": "medium", "question": "Solve: 12 × 35 using distributive: 12 × (30 + 5)", "options": {"A": "12×30 + 12×5 = 420", "B": "12×35 = 420", "C": "360+60 = 420", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 49, "difficulty": "medium", "question": "Which property allows changing order in multiplication?", "options": {"A": "Associative", "B": "Commutative", "C": "Distributive", "D": "Identity"}, "correct_answer": "B"},
    {"id": 50, "difficulty": "medium", "question": "What is 1 × 999?", "options": {"A": "0", "B": "1", "C": "999", "D": "1000"}, "correct_answer": "C"},
    {"id": 51, "difficulty": "medium", "question": "Which property: (9 + 6) + 4 = 9 + (6 + 4)?", "options": {"A": "Commutative addition", "B": "Associative addition", "C": "Distributive", "D": "Identity"}, "correct_answer": "B"},
    {"id": 52, "difficulty": "medium", "question": "What is 45 × 20 using distributive: 45 × (10 + 10)?", "options": {"A": "45×10 + 45×10 = 900", "B": "45×20 = 900", "C": "450+450 = 900", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 53, "difficulty": "medium", "question": "Zero is identity element for:", "options": {"A": "Addition", "B": "Multiplication", "C": "Subtraction", "D": "Division"}, "correct_answer": "A"},
    {"id": 54, "difficulty": "medium", "question": "One is identity element for:", "options": {"A": "Addition", "B": "Multiplication", "C": "Subtraction", "D": "Division"}, "correct_answer": "B"},
    {"id": 55, "difficulty": "medium", "question": "What is 75 × 4 × 25 using associative property?", "options": {"A": "75×(4×25) = 7500", "B": "(75×4)×25 = 7500", "C": "75×100 = 7500", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 56, "difficulty": "medium", "question": "Which property: 23 × 5 = 5 × 23?", "options": {"A": "Associative multiplication", "B": "Commutative multiplication", "C": "Distributive", "D": "Identity"}, "correct_answer": "B"},
    {"id": 57, "difficulty": "medium", "question": "What is 0 × 4567?", "options": {"A": "4567", "B": "0", "C": "1", "D": "45670"}, "correct_answer": "B"},
    {"id": 58, "difficulty": "medium", "question": "Solve: 18 × 105 using distributive: 18 × (100 + 5)", "options": {"A": "18×100 + 18×5 = 1890", "B": "18×105 = 1890", "C": "1800+90 = 1890", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 59, "difficulty": "medium", "question": "What property allows grouping differently in addition?", "options": {"A": "Commutative", "B": "Associative", "C": "Distributive", "D": "Identity"}, "correct_answer": "B"},
    {"id": 60, "difficulty": "medium", "question": "What is 1 × 2500?", "options": {"A": "0", "B": "1", "C": "2500", "D": "2501"}, "correct_answer": "C"},
    {"id": 61, "difficulty": "medium", "question": "Which statement is false for whole numbers?", "options": {"A": "a+0=a", "B": "a×1=a", "C": "a×0=0", "D": "a÷0=0"}, "correct_answer": "D"},
    {"id": 62, "difficulty": "medium", "question": "What is 125 × 32 using distributive: 125 × (30 + 2)?", "options": {"A": "125×30 + 125×2 = 4000", "B": "125×32 = 4000", "C": "3750+250 = 4000", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 63, "difficulty": "medium", "question": "Which property: (8 × 3) × 2 = 8 × (3 × 2)?", "options": {"A": "Commutative", "B": "Associative", "C": "Distributive", "D": "Identity"}, "correct_answer": "B"},
    {"id": 64, "difficulty": "medium", "question": "What is 999 × 0?", "options": {"A": "999", "B": "0", "C": "1", "D": "9990"}, "correct_answer": "B"},
    {"id": 65, "difficulty": "medium", "question": "Solve: 25 × 44 using distributive: 25 × (40 + 4)", "options": {"A": "25×40 + 25×4 = 1100", "B": "25×44 = 1100", "C": "1000+100 = 1100", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 66, "difficulty": "medium", "question": "What property allows a×(b+c) = a×b + a×c?", "options": {"A": "Commutative", "B": "Associative", "C": "Distributive", "D": "Closure"}, "correct_answer": "C"},
    {"id": 67, "difficulty": "medium", "question": "What is 50 × 60 × 2 using associative?", "options": {"A": "50×(60×2) = 6000", "B": "(50×60)×2 = 6000", "C": "50×120 = 6000", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 68, "difficulty": "medium", "question": "Which is always true for whole numbers a and b?", "options": {"A": "a+b = b+a", "B": "a-b = b-a", "C": "a÷b = b÷a", "D": "a^b = b^a"}, "correct_answer": "A"},
    {"id": 69, "difficulty": "medium", "question": "What is 75 × 8 using distributive: 75 × (10 - 2)?", "options": {"A": "75×10 - 75×2 = 600", "B": "75×8 = 600", "C": "750-150 = 600", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 70, "difficulty": "medium", "question": "What property: 0 + 78 = 78?", "options": {"A": "Commutative", "B": "Associative", "C": "Additive identity", "D": "Multiplicative identity"}, "correct_answer": "C"},
    {"id": 71, "difficulty": "medium", "question": "What is 1000 × 1?", "options": {"A": "0", "B": "1", "C": "1000", "D": "1001"}, "correct_answer": "C"},
    {"id": 72, "difficulty": "medium", "question": "Solve: 16 × 25 using properties", "options": {"A": "4×(4×25) = 400", "B": "16×100÷4 = 400", "C": "(4×4)×25 = 400", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 73, "difficulty": "medium", "question": "Which property allows (a+b)+c = a+(b+c)?", "options": {"A": "Commutative", "B": "Associative", "C": "Distributive", "D": "Identity"}, "correct_answer": "B"},
    {"id": 74, "difficulty": "medium", "question": "What is 500 × 0?", "options": {"A": "500", "B": "0", "C": "1", "D": "5000"}, "correct_answer": "B"},
    {"id": 75, "difficulty": "medium", "question": "Solve: 35 × 12 using distributive: 35 × (10 + 2)", "options": {"A": "35×10 + 35×2 = 420", "B": "35×12 = 420", "C": "350+70 = 420", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 76, "difficulty": "medium", "question": "What property: a×b = b×a?", "options": {"A": "Associative multiplication", "B": "Commutative multiplication", "C": "Distributive", "D": "Closure"}, "correct_answer": "B"},
    {"id": 77, "difficulty": "medium", "question": "What is 1 × 8765?", "options": {"A": "0", "B": "1", "C": "8765", "D": "8766"}, "correct_answer": "C"},
    {"id": 78, "difficulty": "medium", "question": "Solve: 125 × 16 using properties", "options": {"A": "125×8×2 = 2000", "B": "(125×8)×2 = 2000", "C": "125×(8×2) = 2000", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 79, "difficulty": "medium", "question": "Which property: (2+3)+4 = 2+(3+4)?", "options": {"A": "Commutative", "B": "Associative", "C": "Distributive", "D": "Identity"}, "correct_answer": "B"},
    {"id": 80, "difficulty": "medium", "question": "What is 0 × 9999?", "options": {"A": "9999", "B": "0", "C": "1", "D": "99990"}, "correct_answer": "B"},
    {"id": 81, "difficulty": "hard", "question": "Using distributive property, calculate: 47 × 102", "options": {"A": "47×100 + 47×2 = 4794", "B": "47×102 = 4794", "C": "4700+94 = 4794", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 82, "difficulty": "hard", "question": "Find 125 × 88 using distributive property", "options": {"A": "125×80 + 125×8 = 11000", "B": "125×88 = 11000", "C": "10000+1000 = 11000", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 83, "difficulty": "hard", "question": "Calculate 25 × 48 × 4 using associative property efficiently", "options": {"A": "25×(48×4) = 4800", "B": "(25×48)×4 = 4800", "C": "25×192 = 4800", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 84, "difficulty": "hard", "question": "Find 999 × 7 using distributive property: (1000-1)×7", "options": {"A": "1000×7 - 1×7 = 6993", "B": "999×7 = 6993", "C": "7000-7 = 6993", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 85, "difficulty": "hard", "question": "Calculate 75 × 24 using distributive: 75 × (20 + 4)", "options": {"A": "75×20 + 75×4 = 1800", "B": "75×24 = 1800", "C": "1500+300 = 1800", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 86, "difficulty": "hard", "question": "Find 16 × 125 using properties: 2 × (8 × 125)", "options": {"A": "2×1000 = 2000", "B": "16×125 = 2000", "C": "(2×8)×125 = 2000", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 87, "difficulty": "hard", "question": "Calculate 35 × 18 using distributive: 35 × (20 - 2)", "options": {"A": "35×20 - 35×2 = 630", "B": "35×18 = 630", "C": "700-70 = 630", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 88, "difficulty": "hard", "question": "Find 250 × 40 using properties: (25×10) × (4×10)", "options": {"A": "25×4×100 = 10000", "B": "250×40 = 10000", "C": "100×100 = 10000", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 89, "difficulty": "hard", "question": "Calculate 99 × 25 using distributive: (100-1)×25", "options": {"A": "100×25 - 1×25 = 2475", "B": "99×25 = 2475", "C": "2500-25 = 2475", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 90, "difficulty": "hard", "question": "Find 125 × 32 × 25 using associative property", "options": {"A": "125×(32×25) = 100000", "B": "(125×32)×25 = 100000", "C": "125×800 = 100000", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 91, "difficulty": "hard", "question": "Calculate 45 × 98 using distributive: 45 × (100 - 2)", "options": {"A": "45×100 - 45×2 = 4410", "B": "45×98 = 4410", "C": "4500-90 = 4410", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 92, "difficulty": "hard", "question": "Find 64 × 125 using properties: 8 × (8 × 125)", "options": {"A": "8×1000 = 8000", "B": "64×125 = 8000", "C": "(8×8)×125 = 8000", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 93, "difficulty": "hard", "question": "Calculate 85 × 102 using distributive: 85 × (100 + 2)", "options": {"A": "85×100 + 85×2 = 8670", "B": "85×102 = 8670", "C": "8500+170 = 8670", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 94, "difficulty": "hard", "question": "Find 75 × 28 using distributive: 75 × (30 - 2)", "options": {"A": "75×30 - 75×2 = 2100", "B": "75×28 = 2100", "C": "2250-150 = 2100", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 95, "difficulty": "hard", "question": "Calculate 125 × 56 using properties: 125 × (8 × 7)", "options": {"A": "(125×8)×7 = 7000", "B": "125×56 = 7000", "C": "1000×7 = 7000", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 96, "difficulty": "hard", "question": "Find 99 × 99 using distributive: (100-1)×(100-1)", "options": {"A": "10000 - 200 + 1 = 9801", "B": "99×99 = 9801", "C": "(100×100) - (100×1) - (1×100) + (1×1) = 9801", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 97, "difficulty": "hard", "question": "Calculate 250 × 48 using distributive: 250 × (50 - 2)", "options": {"A": "250×50 - 250×2 = 12000", "B": "250×48 = 12000", "C": "12500-500 = 12000", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 98, "difficulty": "hard", "question": "Find 16 × 225 using properties: 4 × (4 × 225)", "options": {"A": "4×900 = 3600", "B": "16×225 = 3600", "C": "(4×4)×225 = 3600", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 99, "difficulty": "hard", "question": "Calculate 125 × 72 using distributive: 125 × (70 + 2)", "options": {"A": "125×70 + 125×2 = 9000", "B": "125×72 = 9000", "C": "8750+250 = 9000", "D": "All of the above"}, "correct_answer": "D"},
    {"id": 100, "difficulty": "hard", "question": "Find 999 × 8 using distributive: (1000-1)×8", "options": {"A": "1000×8 - 1×8 = 7992", "B": "999×8 = 7992", "C": "8000-8 = 7992", "D": "All of the above"}, "correct_answer": "D"}
 ,
{"id":101,"difficulty":"easy","question":"What is 10 + 0?","options":{"A":"0","B":"1","C":"10","D":"100"},"correct_answer":"C"},
  {"id":102,"difficulty":"easy","question":"What is 1 × 67?","options":{"A":"0","B":"1","C":"67","D":"68"},"correct_answer":"C"},
  {"id":103,"difficulty":"easy","question":"Does 12 + 5 = 5 + 12 show commutative property?","options":{"A":"Yes","B":"No","C":"Sometimes","D":"Never"},"correct_answer":"A"},
  {"id":104,"difficulty":"easy","question":"What is 6 × 0?","options":{"A":"6","B":"0","C":"1","D":"60"},"correct_answer":"B"},
  {"id":105,"difficulty":"easy","question":"What is (4 + 6) + 5?","options":{"A":"10","B":"14","C":"15","D":"20"},"correct_answer":"C"},
  {"id":106,"difficulty":"easy","question":"What is 4 + (6 + 5)?","options":{"A":"10","B":"14","C":"15","D":"20"},"correct_answer":"C"},
  {"id":107,"difficulty":"easy","question":"What is 9 × 1?","options":{"A":"0","B":"1","C":"9","D":"10"},"correct_answer":"C"},
  {"id":108,"difficulty":"easy","question":"What is 0 + 89?","options":{"A":"0","B":"1","C":"89","D":"890"},"correct_answer":"C"},
  {"id":109,"difficulty":"easy","question":"Is (2 × 5) × 3 = 2 × (5 × 3)?","options":{"A":"Yes","B":"No","C":"Only sometimes","D":"Never"},"correct_answer":"A"},
  {"id":110,"difficulty":"easy","question":"What is 14 × 0?","options":{"A":"14","B":"0","C":"1","D":"140"},"correct_answer":"B"},

  {"id":111,"difficulty":"easy","question":"What is 18 + 0?","options":{"A":"0","B":"1","C":"18","D":"180"},"correct_answer":"C"},
  {"id":112,"difficulty":"easy","question":"Does 7 × 9 = 9 × 7 show commutative property?","options":{"A":"Yes","B":"No","C":"Sometimes","D":"Never"},"correct_answer":"A"},
  {"id":113,"difficulty":"easy","question":"What is 1 × 305?","options":{"A":"0","B":"1","C":"305","D":"306"},"correct_answer":"C"},
  {"id":114,"difficulty":"easy","question":"What is 0 × 72?","options":{"A":"72","B":"0","C":"1","D":"720"},"correct_answer":"B"},
  {"id":115,"difficulty":"easy","question":"Which property: 5 + (4 + 1) = (5 + 4) + 1?","options":{"A":"Commutative","B":"Associative","C":"Identity","D":"Distributive"},"correct_answer":"B"},
  {"id":116,"difficulty":"easy","question":"Which property: 6 × (3 × 2) = (6 × 3) × 2?","options":{"A":"Commutative","B":"Associative","C":"Identity","D":"Distributive"},"correct_answer":"B"},
  {"id":117,"difficulty":"easy","question":"What is 0 added to any whole number?","options":{"A":"0","B":"1","C":"The same number","D":"10"},"correct_answer":"C"},
  {"id":118,"difficulty":"easy","question":"What is any whole number multiplied by 1?","options":{"A":"0","B":"1","C":"The same number","D":"Number + 1"},"correct_answer":"C"},
  {"id":119,"difficulty":"easy","question":"Does 0 × 456 = 0 show which property?","options":{"A":"Commutative","B":"Associative","C":"Zero property of multiplication","D":"Identity"},"correct_answer":"C"},
  {"id":120,"difficulty":"easy","question":"What is (8 + 2) + 0?","options":{"A":"0","B":"8","C":"10","D":"20"},"correct_answer":"C"},

  {"id":121,"difficulty":"medium","question":"Which property is shown: 34 + 21 = 21 + 34?","options":{"A":"Associative","B":"Commutative","C":"Identity","D":"Distributive"},"correct_answer":"B"},
  {"id":122,"difficulty":"medium","question":"Which property is shown: (7 × 5) × 2 = 7 × (5 × 2)?","options":{"A":"Commutative","B":"Associative","C":"Distributive","D":"Identity"},"correct_answer":"B"},
  {"id":123,"difficulty":"medium","question":"What is the additive identity of whole numbers?","options":{"A":"1","B":"0","C":"-1","D":"10"},"correct_answer":"B"},
  {"id":124,"difficulty":"medium","question":"What is the multiplicative identity of whole numbers?","options":{"A":"0","B":"1","C":"-1","D":"10"},"correct_answer":"B"},
  {"id":125,"difficulty":"medium","question":"Solve using distributive property: 6 × (10 + 4)","options":{"A":"6×10 + 6×4 = 84","B":"6×14 = 84","C":"60+24 = 84","D":"All of these"},"correct_answer":"D"},
  {"id":126,"difficulty":"medium","question":"Which property allows regrouping numbers in addition?","options":{"A":"Commutative","B":"Associative","C":"Distributive","D":"Identity"},"correct_answer":"B"},
  {"id":127,"difficulty":"medium","question":"Which property allows changing order in multiplication?","options":{"A":"Associative","B":"Commutative","C":"Distributive","D":"Identity"},"correct_answer":"B"},
  {"id":128,"difficulty":"medium","question":"What is 0 × any whole number?","options":{"A":"The number itself","B":"0","C":"1","D":"Undefined"},"correct_answer":"B"},
  {"id":129,"difficulty":"medium","question":"Which property is NOT satisfied by subtraction of whole numbers?","options":{"A":"Closure","B":"Commutative","C":"Associative","D":"All of these"},"correct_answer":"D"},
  {"id":130,"difficulty":"medium","question":"Which of these is NOT true for whole numbers?","options":{"A":"a+b=b+a","B":"a×b=b×a","C":"a-b=b-a","D":"(a+b)+c=a+(b+c)"},"correct_answer":"C"},

  {"id":131,"difficulty":"medium","question":"Solve: 25 × (20 + 6) using distributive property","options":{"A":"25×20 + 25×6 = 650","B":"25×26 = 650","C":"500+150 = 650","D":"All of these"},"correct_answer":"D"},
  {"id":132,"difficulty":"medium","question":"What property: 0 + 999 = 999?","options":{"A":"Commutative","B":"Associative","C":"Additive identity","D":"Multiplicative identity"},"correct_answer":"C"},
  {"id":133,"difficulty":"medium","question":"Solve: 18 × (50 - 2)","options":{"A":"18×50 - 18×2 = 864","B":"18×48 = 864","C":"900-36 = 864","D":"All of these"},"correct_answer":"D"},
  {"id":134,"difficulty":"medium","question":"What is 1 × 4321?","options":{"A":"0","B":"1","C":"4321","D":"4322"},"correct_answer":"C"},
  {"id":135,"difficulty":"medium","question":"Which property: (4 + 5) + 6 = 4 + (5 + 6)?","options":{"A":"Commutative","B":"Associative","C":"Distributive","D":"Identity"},"correct_answer":"B"},
  {"id":136,"difficulty":"medium","question":"Solve: 40 × 25 using properties","options":{"A":"(4×25)×10 = 1000","B":"40×25 = 1000","C":"100×10 = 1000","D":"All of these"},"correct_answer":"D"},
  {"id":137,"difficulty":"medium","question":"What is 0 × 999?","options":{"A":"999","B":"0","C":"1","D":"9990"},"correct_answer":"B"},
  {"id":138,"difficulty":"medium","question":"Which property: 9 × (4 + 6) = 9×4 + 9×6?","options":{"A":"Commutative","B":"Associative","C":"Distributive","D":"Identity"},"correct_answer":"C"},
  {"id":139,"difficulty":"medium","question":"Solve: 125 × 24 using distributive","options":{"A":"125×20 + 125×4 = 3000","B":"125×24 = 3000","C":"2500+500 = 3000","D":"All of these"},"correct_answer":"D"},
  {"id":140,"difficulty":"medium","question":"Which element keeps number unchanged in multiplication?","options":{"A":"0","B":"1","C":"2","D":"10"},"correct_answer":"B"},

  {"id":141,"difficulty":"hard","question":"Using distributive property, find: 98 × 45","options":{"A":"(100-2)×45 = 4410","B":"98×45 = 4410","C":"4500-90 = 4410","D":"All of these"},"correct_answer":"D"},
  {"id":142,"difficulty":"hard","question":"Calculate 125 × 64 using properties","options":{"A":"(125×8)×8 = 8000","B":"125×64 = 8000","C":"1000×8 = 8000","D":"All of these"},"correct_answer":"D"},
  {"id":143,"difficulty":"hard","question":"Find 75 × 36 using distributive","options":{"A":"75×(40-4) = 2700","B":"75×36 = 2700","C":"3000-300 = 2700","D":"All of these"},"correct_answer":"D"},
  {"id":144,"difficulty":"hard","question":"Calculate 999 × 12 using distributive","options":{"A":"(1000-1)×12 = 11988","B":"999×12 = 11988","C":"12000-12 = 11988","D":"All of these"},"correct_answer":"D"},
  {"id":145,"difficulty":"hard","question":"Find 250 × 96 using distributive","options":{"A":"250×(100-4) = 24000","B":"250×96 = 24000","C":"25000-1000 = 24000","D":"All of these"},"correct_answer":"D"},
  {"id":146,"difficulty":"hard","question":"Calculate 48 × 125 using properties","options":{"A":"(6×8)×125 = 6000","B":"48×125 = 6000","C":"1000×6 = 6000","D":"All of these"},"correct_answer":"D"},
  {"id":147,"difficulty":"hard","question":"Find 99 × 64 using distributive","options":{"A":"(100-1)×64 = 6336","B":"99×64 = 6336","C":"6400-64 = 6336","D":"All of these"},"correct_answer":"D"},
  {"id":148,"difficulty":"hard","question":"Calculate 125 × 144 using properties","options":{"A":"125×(12×12) = 18000","B":"125×144 = 18000","C":"1500×12 = 18000","D":"All of these"},"correct_answer":"D"},
  {"id":149,"difficulty":"hard","question":"Find 75 × 128 using associative property","options":{"A":"75×(64×2) = 9600","B":"(75×64)×2 = 9600","C":"4800×2 = 9600","D":"All of these"},"correct_answer":"D"},
  {"id":150,"difficulty":"hard","question":"Using distributive property, calculate: 999 × 25","options":{"A":"(1000-1)×25 = 24975","B":"999×25 = 24975","C":"25000-25 = 24975","D":"All of these"},"correct_answer":"D"}
 ]
}