{
  "title": "Estimation of Sums and Differences - Grade 3 (New Set)",
  "total_questions": 60,
  "questions": [



    {"id": 1, "difficulty": "easy", "question": "Estimate the sum: 46 + 33 (round to nearest 10)", "options": {"A": "80", "B": "70", "C": "60", "D": "79"}, "correct_answer": "A"},
    {"id": 2, "difficulty": "easy", "question": "Estimate the difference: 92 - 18 (round to nearest 10)", "options": {"A": "60", "B": "70", "C": "50", "D": "65"}, "correct_answer": "B"},
    {"id": 3, "difficulty": "easy", "question": "Estimate the sum: 27 + 64", "options": {"A": "70", "B": "80", "C": "90", "D": "95"}, "correct_answer": "C"},
    {"id": 4, "difficulty": "easy", "question": "Estimate the difference: 73 - 29", "options": {"A": "30", "B": "50", "C": "60", "D": "40"}, "correct_answer": "D"},
    {"id": 5, "difficulty": "easy", "question": "Round and estimate: 18 + 52", "options": {"A": "70", "B": "60", "C": "80", "D": "68"}, "correct_answer": "A"},
    {"id": 6, "difficulty": "easy", "question": "Round and estimate: 67 - 41", "options": {"A": "10", "B": "20", "C": "30", "D": "15"}, "correct_answer": "B"},
    {"id": 7, "difficulty": "easy", "question": "Estimate the sum of 39 + 46", "options": {"A": "70", "B": "60", "C": "80", "D": "85"}, "correct_answer": "C"},
    {"id": 8, "difficulty": "easy", "question": "Estimate the difference: 88 - 33", "options": {"A": "40", "B": "50", "C": "60", "D": "55"}, "correct_answer": "D"},
    {"id": 9, "difficulty": "easy", "question": "Round and add: 21 + 69", "options": {"A": "100", "B": "80", "C": "90", "D": "95"}, "correct_answer": "A"},
    {"id": 10, "difficulty": "easy", "question": "Round and subtract: 91 - 58", "options": {"A": "40", "B": "30", "C": "20", "D": "35"}, "correct_answer": "B"},
    {"id": 11, "difficulty": "easy", "question": "Estimate the sum: 43 + 38", "options": {"A": "90", "B": "70", "C": "80", "D": "81"}, "correct_answer": "C"},
    {"id": 12, "difficulty": "easy", "question": "Estimate the difference: 64 - 27", "options": {"A": "40", "B": "30", "C": "20", "D": "39"}, "correct_answer": "D"},
    {"id": 13, "difficulty": "easy", "question": "Round to nearest 10: 26 + 54", "options": {"A": "80", "B": "70", "C": "90", "D": "79"}, "correct_answer": "A"},
    {"id": 14, "difficulty": "easy", "question": "Round to nearest 10: 72 - 18", "options": {"A": "40", "B": "50", "C": "60", "D": "54"}, "correct_answer": "B"},
    {"id": 15, "difficulty": "easy", "question": "Estimate: 25 + 68", "options": {"A": "80", "B": "70", "C": "90", "D": "93"}, "correct_answer": "C"},
    {"id": 16, "difficulty": "easy", "question": "Estimate: 84 - 39", "options": {"A": "40", "B": "30", "C": "50", "D": "45"}, "correct_answer": "D"},
    {"id": 17, "difficulty": "easy", "question": "Estimate the sum: 59 + 32", "options": {"A": "90", "B": "80", "C": "70", "D": "88"}, "correct_answer": "A"},
    {"id": 18, "difficulty": "easy", "question": "Estimate the difference: 63 - 21", "options": {"A": "30", "B": "40", "C": "20", "D": "42"}, "correct_answer": "B"},
    {"id": 19, "difficulty": "easy", "question": "Round and add: 48 + 33", "options": {"A": "80", "B": "70", "C": "90", "D": "79"}, "correct_answer": "C"},
    {"id": 20, "difficulty": "easy", "question": "Round and subtract: 76 - 48", "options": {"A": "20", "B": "40", "C": "30", "D": "28"}, "correct_answer": "D"},

   

    {"id": 21, "difficulty": "medium", "question": "Estimate: 247 + 362 (round to nearest 100)", "options": {"A": "600", "B": "500", "C": "700", "D": "609"}, "correct_answer": "A"},
    {"id": 22, "difficulty": "medium", "question": "Estimate: 689 - 241 (round to nearest 100)", "options": {"A": "500", "B": "400", "C": "300", "D": "448"}, "correct_answer": "B"},
    {"id": 23, "difficulty": "medium", "question": "Estimate the sum: 324 + 478", "options": {"A": "600", "B": "700", "C": "800", "D": "802"}, "correct_answer": "C"},
    {"id": 24, "difficulty": "medium", "question": "Estimate the difference: 915 - 462", "options": {"A": "300", "B": "400", "C": "500", "D": "453"}, "correct_answer": "D"},
    {"id": 25, "difficulty": "medium", "question": "Round to nearest 10: 432 + 167", "options": {"A": "600", "B": "500", "C": "700", "D": "599"}, "correct_answer": "A"},
    {"id": 26, "difficulty": "medium", "question": "Round to nearest 10: 854 - 439", "options": {"A": "300", "B": "400", "C": "500", "D": "415"}, "correct_answer": "B"},
    {"id": 27, "difficulty": "medium", "question": "Estimate the sum: 243 + 359", "options": {"A": "500", "B": "600", "C": "700", "D": "602"}, "correct_answer": "C"},
    {"id": 28, "difficulty": "medium", "question": "Estimate the difference: 728 - 319", "options": {"A": "300", "B": "400", "C": "500", "D": "409"}, "correct_answer": "D"},
    {"id": 29, "difficulty": "medium", "question": "Estimate by rounding: 561 + 289", "options": {"A": "800", "B": "700", "C": "900", "D": "850"}, "correct_answer": "A"},
    {"id": 30, "difficulty": "medium", "question": "Estimate by rounding: 902 - 476", "options": {"A": "300", "B": "400", "C": "500", "D": "426"}, "correct_answer": "B"},
    {"id": 31, "difficulty": "medium", "question": "Estimate the sum: 187 + 365", "options": {"A": "400", "B": "500", "C": "600", "D": "552"}, "correct_answer": "C"},
    {"id": 32, "difficulty": "medium", "question": "Estimate the difference: 821 - 294", "options": {"A": "500", "B": "400", "C": "300", "D": "527"}, "correct_answer": "D"},
    {"id": 33, "difficulty": "medium", "question": "Round to nearest 100: 543 + 368", "options": {"A": "900", "B": "800", "C": "700", "D": "911"}, "correct_answer": "A"},
    {"id": 34, "difficulty": "medium", "question": "Round to nearest 100: 987 - 543", "options": {"A": "300", "B": "400", "C": "500", "D": "444"}, "correct_answer": "B"},
    {"id": 35, "difficulty": "medium", "question": "Estimate: 267 + 518", "options": {"A": "700", "B": "800", "C": "900", "D": "785"}, "correct_answer": "C"},
    {"id": 36, "difficulty": "medium", "question": "Estimate: 672 - 248", "options": {"A": "500", "B": "300", "C": "400", "D": "424"}, "correct_answer": "D"},
    {"id": 37, "difficulty": "medium", "question": "Estimate the sum: 311 + 487", "options": {"A": "800", "B": "700", "C": "900", "D": "798"}, "correct_answer": "A"},
    {"id": 38, "difficulty": "medium", "question": "Estimate the difference: 741 - 329", "options": {"A": "400", "B": "300", "C": "500", "D": "412"}, "correct_answer": "B"},
    {"id": 39, "difficulty": "medium", "question": "Round and add: 458 + 339", "options": {"A": "800", "B": "900", "C": "700", "D": "797"}, "correct_answer": "C"},
    {"id": 40, "difficulty": "medium", "question": "Round and subtract: 983 - 642", "options": {"A": "300", "B": "500", "C": "400", "D": "341"}, "correct_answer": "D"},

 

    {"id": 41, "difficulty": "hard", "question": "Estimate to nearest 100: 564 + 789", "options": {"A": "1400", "B": "1300", "C": "1500", "D": "1353"}, "correct_answer": "A"},
    {"id": 42, "difficulty": "hard", "question": "Estimate to nearest 100: 987 - 432", "options": {"A": "700", "B": "600", "C": "500", "D": "555"}, "correct_answer": "B"},
    {"id": 43, "difficulty": "hard", "question": "Estimate the sum of 678 + 901", "options": {"A": "1500", "B": "1400", "C": "1600", "D": "1579"}, "correct_answer": "C"},
    {"id": 44, "difficulty": "hard", "question": "Estimate the difference: 876 - 234", "options": {"A": "600", "B": "700", "C": "500", "D": "642"}, "correct_answer": "D"},
    {"id": 45, "difficulty": "hard", "question": "Round and add: 789 + 123", "options": {"A": "900", "B": "800", "C": "1000", "D": "912"}, "correct_answer": "A"},
    {"id": 46, "difficulty": "hard", "question": "Round and subtract: 845 - 376", "options": {"A": "400", "B": "500", "C": "300", "D": "469"}, "correct_answer": "B"},
    {"id": 47, "difficulty": "hard", "question": "Estimate to nearest 100: 345 + 768", "options": {"A": "1100", "B": "1000", "C": "1200", "D": "1113"}, "correct_answer": "C"},
    {"id": 48, "difficulty": "hard", "question": "Estimate to nearest 100: 924 - 487", "options": {"A": "400", "B": "500", "C": "300", "D": "437"}, "correct_answer": "D"},
    {"id": 49, "difficulty": "hard", "question": "Estimate the sum: 567 + 890", "options": {"A": "1400", "B": "1500", "C": "1300", "D": "1457"}, "correct_answer": "A"},
    {"id": 50, "difficulty": "hard", "question": "Estimate the difference: 987 - 765", "options": {"A": "200", "B": "300", "C": "400", "D": "222"}, "correct_answer": "B"},
    {"id": 51, "difficulty": "hard", "question": "Estimate the sum: 451 + 678", "options": {"A": "1200", "B": "1100", "C": "1300", "D": "1129"}, "correct_answer": "C"},
    {"id": 52, "difficulty": "hard", "question": "Estimate the difference: 902 - 567", "options": {"A": "300", "B": "400", "C": "200", "D": "335"}, "correct_answer": "D"},
    {"id": 53, "difficulty": "hard", "question": "Estimate by rounding to nearest 10: 763 + 458", "options": {"A": "1200", "B": "1100", "C": "1300", "D": "1221"}, "correct_answer": "A"},
    {"id": 54, "difficulty": "hard", "question": "Estimate by rounding to nearest 10: 854 - 267", "options": {"A": "400", "B": "600", "C": "500", "D": "587"}, "correct_answer": "B"},
    {"id": 55, "difficulty": "hard", "question": "Estimate the sum: 612 + 789", "options": {"A": "1400", "B": "1300", "C": "1500", "D": "1401"}, "correct_answer": "C"},
    {"id": 56, "difficulty": "hard", "question": "Estimate the difference: 964 - 421", "options": {"A": "600", "B": "500", "C": "400", "D": "543"}, "correct_answer": "D"},
    {"id": 57, "difficulty": "hard", "question": "Round and add: 834 + 279", "options": {"A": "1100", "B": "1000", "C": "1200", "D": "1113"}, "correct_answer": "A"},
    {"id": 58, "difficulty": "hard", "question": "Round and subtract: 732 - 468", "options": {"A": "200", "B": "300", "C": "400", "D": "264"}, "correct_answer": "B"},
    {"id": 59, "difficulty": "hard", "question": "Estimate the sum: 789 + 567", "options": {"A": "1400", "B": "1300", "C": "1500", "D": "1356"}, "correct_answer": "C"},
    {"id": 60, "difficulty": "hard", "question": "Estimate the difference: 999 - 678", "options": {"A": "300", "B": "400", "C": "200", "D": "321"}, "correct_answer": "D"}

  ]
}