{
  "title": "3-Digit Subtraction with Borrow - Grade 3",
  "total_questions": 100,
  "questions": [
   {"id": 1, "difficulty": "easy",
 "question": "What is 456 - 123?",
 "options": {"A": "333", "B": "323", "C": "343", "D": "353"},
 "correct_answer": "A"},

{"id": 2, "difficulty": "easy",
 "question": "Calculate: 340 - 218",
 "options": {"A": "102", "B": "122", "C": "132", "D": "112"},
 "correct_answer": "B"},

{"id": 3, "difficulty": "easy",
 "question": "Subtract: 382 - 127",
 "options": {"A": "245", "B": "235", "C": "255", "D": "265"},
 "correct_answer": "C"},

{"id": 4, "difficulty": "easy",
 "question": "What is the difference between 205 and 194?",
 "options": {"A": "1", "B": "11", "C": "21", "D": "31"},
 "correct_answer": "D"},

{"id": 5, "difficulty": "easy",
 "question": "Solve: 411 - 123",
 "options": {"A": "288", "B": "278", "C": "298", "D": "308"},
 "correct_answer": "A"},

{"id": 6, "difficulty": "easy",
 "question": "Find the result: 240 - 156",
 "options": {"A": "64", "B": "84", "C": "74", "D": "94"},
 "correct_answer": "B"},

{"id": 7, "difficulty": "easy",
 "question": "Subtract: 603 - 297",
 "options": {"A": "296", "B": "306", "C": "316", "D": "286"},
 "correct_answer": "C"},

{"id": 8, "difficulty": "easy",
 "question": "What is 432 - 368?",
 "options": {"A": "44", "B": "64", "C": "54", "D": "74"},
 "correct_answer": "D"},

{"id": 9, "difficulty": "easy",
 "question": "Calculate: 574 - 226",
 "options": {"A": "338", "B": "348", "C": "358", "D": "328"},
 "correct_answer": "A"},

{"id": 10, "difficulty": "easy",
 "question": "Subtract: 411 - 189",
 "options": {"A": "212", "B": "222", "C": "232", "D": "202"},
 "correct_answer": "B"},

{"id": 11, "difficulty": "easy",
 "question": "What is 325 - 275?",
 "options": {"A": "40", "B": "50", "C": "60", "D": "30"},
 "correct_answer": "C"},

{"id": 12, "difficulty": "easy",
 "question": "Solve: 488 - 312",
 "options": {"A": "166", "B": "176", "C": "186", "D": "156"},
 "correct_answer": "D"},

{"id": 13, "difficulty": "easy",
 "question": "Find the difference: 433 - 367",
 "options": {"A": "56", "B": "66", "C": "76", "D": "86"},
 "correct_answer": "A"},

{"id": 14, "difficulty": "easy",
 "question": "Subtract: 506 - 294",
 "options": {"A": "212", "B": "202", "C": "222", "D": "232"},
 "correct_answer": "B"},

{"id": 15, "difficulty": "easy",
 "question": "What is 651 - 149?",
 "options": {"A": "492", "B": "502", "C": "512", "D": "482"},
 "correct_answer": "C"},

{"id": 16, "difficulty": "easy",
 "question": "Calculate: 723 - 177",
 "options": {"A": "536", "B": "546", "C": "556", "D": "526"},
 "correct_answer": "D"},

{"id": 17, "difficulty": "easy",
 "question": "Subtract: 855 - 145",
 "options": {"A": "700", "B": "710", "C": "720", "D": "690"},
 "correct_answer": "A"},

{"id": 18, "difficulty": "easy",
 "question": "What is 962 - 38?",
 "options": {"A": "904", "B": "924", "C": "914", "D": "934"},
 "correct_answer": "B"},

{"id": 19, "difficulty": "easy",
 "question": "Solve: 522 - 478",
 "options": {"A": "34", "B": "44", "C": "24", "D": "14"},
 "correct_answer": "C"},

{"id": 20, "difficulty": "easy",
 "question": "Find the result: 601 - 399",
 "options": {"A": "202", "B": "192", "C": "182", "D": "212"},
 "correct_answer": "D"}
,
{"id": 21, "difficulty": "medium",
 "question": "What is 456 - 287?",
 "options": {"A": "169", "B": "159", "C": "179", "D": "189"},
 "correct_answer": "A"},

{"id": 22, "difficulty": "medium",
 "question": "Calculate: 468 - 374",
 "options": {"A": "74", "B": "94", "C": "84", "D": "104"},
 "correct_answer": "B"},

{"id": 23, "difficulty": "medium",
 "question": "Subtract: 529 - 386",
 "options": {"A": "133", "B": "143", "C": "153", "D": "123"},
 "correct_answer": "C"},

{"id": 24, "difficulty": "medium",
 "question": "What is the difference between 647 and 295?",
 "options": {"A": "342", "B": "352", "C": "362", "D": "332"},
 "correct_answer": "D"},

{"id": 25, "difficulty": "medium",
 "question": "Solve: 783 - 159",
 "options": {"A": "624", "B": "614", "C": "634", "D": "604"},
 "correct_answer": "A"},

{"id": 26, "difficulty": "medium",
 "question": "Find the result: 862 - 149",
 "options": {"A": "703", "B": "713", "C": "723", "D": "693"},
 "correct_answer": "B"},

{"id": 27, "difficulty": "medium",
 "question": "Subtract: 495 - 378",
 "options": {"A": "107", "B": "117", "C": "127", "D": "97"},
 "correct_answer": "C"},

{"id": 28, "difficulty": "medium",
 "question": "What is 568 - 274?",
 "options": {"A": "294", "B": "284", "C": "304", "D": "274"},
 "correct_answer": "D"},

{"id": 29, "difficulty": "medium",
 "question": "Calculate: 691 - 329",
 "options": {"A": "352", "B": "362", "C": "372", "D": "342"},
 "correct_answer": "A"},

{"id": 30, "difficulty": "medium",
 "question": "Subtract: 744 - 268",
 "options": {"A": "466", "B": "476", "C": "486", "D": "456"},
 "correct_answer": "B"},

{"id": 31, "difficulty": "medium",
 "question": "What is 825 - 197?",
 "options": {"A": "618", "B": "628", "C": "638", "D": "608"},
 "correct_answer": "C"},

{"id": 32, "difficulty": "medium",
 "question": "Solve: 936 - 185",
 "options": {"A": "741", "B": "751", "C": "761", "D": "731"},
 "correct_answer": "D"},

{"id": 33, "difficulty": "medium",
 "question": "Find the difference: 477 - 366",
 "options": {"A": "101", "B": "111", "C": "121", "D": "91"},
 "correct_answer": "A"},

{"id": 34, "difficulty": "medium",
 "question": "Subtract: 588 - 444",
 "options": {"A": "134", "B": "144", "C": "154", "D": "124"},
 "correct_answer": "B"},

{"id": 35, "difficulty": "medium",
 "question": "What is 659 - 273?",
 "options": {"A": "376", "B": "386", "C": "396", "D": "366"},
 "correct_answer": "C"},

{"id": 36, "difficulty": "medium",
 "question": "Calculate: 772 - 159",
 "options": {"A": "603", "B": "613", "C": "623", "D": "593"},
 "correct_answer": "D"},

{"id": 37, "difficulty": "medium",
 "question": "Subtract: 883 - 238",
 "options": {"A": "635", "B": "645", "C": "655", "D": "625"},
 "correct_answer": "A"},

{"id": 38, "difficulty": "medium",
 "question": "What is 994 - 107?",
 "options": {"A": "887", "B": "877", "C": "897", "D": "867"},
 "correct_answer": "B"},

{"id": 39, "difficulty": "medium",
 "question": "Solve: 478 - 365",
 "options": {"A": "103", "B": "113", "C": "123", "D": "93"},
 "correct_answer": "C"},

{"id": 40, "difficulty": "medium",
 "question": "Find the result: 476 - 389",
 "options": {"A": "77", "B": "87", "C": "97", "D": "67"},
 "correct_answer": "D"}
,
{"id": 41, "difficulty": "hard",
 "question": "Subtract: 999 - 888",
 "options": {"A": "111", "B": "101", "C": "121", "D": "131"},
 "correct_answer": "A"},

{"id": 42, "difficulty": "hard",
 "question": "What is 876 - 765?",
 "options": {"A": "91", "B": "111", "C": "101", "D": "121"},
 "correct_answer": "B"},

{"id": 43, "difficulty": "hard",
 "question": "Calculate: 987 - 654",
 "options": {"A": "313", "B": "343", "C": "333", "D": "323"},
 "correct_answer": "C"},

{"id": 44, "difficulty": "hard",
 "question": "Subtract: 888 - 777",
 "options": {"A": "91", "B": "101", "C": "111", "D": "121"},
 "correct_answer": "D"},

{"id": 45, "difficulty": "hard",
 "question": "What is 777 - 666?",
 "options": {"A": "111", "B": "121", "C": "101", "D": "131"},
 "correct_answer": "A"},

{"id": 46, "difficulty": "hard",
 "question": "Solve: 666 - 555",
 "options": {"A": "91", "B": "101", "C": "111", "D": "121"},
 "correct_answer": "B"},

{"id": 47, "difficulty": "hard",
 "question": "Find the result: 555 - 444",
 "options": {"A": "91", "B": "101", "C": "111", "D": "121"},
 "correct_answer": "C"},

{"id": 48, "difficulty": "hard",
 "question": "Subtract: 444 - 333",
 "options": {"A": "91", "B": "101", "C": "111", "D": "121"},
 "correct_answer": "D"},

{"id": 49, "difficulty": "hard",
 "question": "What is 333 - 222?",
 "options": {"A": "101", "B": "111", "C": "121", "D": "91"},
 "correct_answer": "A"},

{"id": 50, "difficulty": "hard",
 "question": "Calculate: 222 - 111",
 "options": {"A": "91", "B": "101", "C": "111", "D": "81"},
 "correct_answer": "B"},

{"id": 51, "difficulty": "hard",
 "question": "Subtract: 111 - 999",
 "options": {"A": "-888", "B": "-878", "C": "-898", "D": "-908"},
 "correct_answer": "C"},

{"id": 52, "difficulty": "hard",
 "question": "What is 222 - 888?",
 "options": {"A": "-676", "B": "-666", "C": "-656", "D": "-686"},
 "correct_answer": "D"},

{"id": 53, "difficulty": "hard",
 "question": "Solve: 333 - 777",
 "options": {"A": "-454", "B": "-444", "C": "-434", "D": "-464"},
 "correct_answer": "A"},

{"id": 54, "difficulty": "hard",
 "question": "Find the difference: 444 - 666",
 "options": {"A": "-212", "B": "-222", "C": "-232", "D": "-242"},
 "correct_answer": "B"},

{"id": 55, "difficulty": "hard",
 "question": "Subtract: 555 - 555",
 "options": {"A": "0", "B": "-10", "C": "10", "D": "-20"},
 "correct_answer": "C"},

{"id": 56, "difficulty": "hard",
 "question": "What is 666 - 444?",
 "options": {"A": "202", "B": "212", "C": "222", "D": "232"},
 "correct_answer": "D"},

{"id": 57, "difficulty": "hard",
 "question": "Calculate: 777 - 333",
 "options": {"A": "424", "B": "434", "C": "444", "D": "454"},
 "correct_answer": "A"},

{"id": 58, "difficulty": "hard",
 "question": "Subtract: 888 - 222",
 "options": {"A": "666", "B": "656", "C": "676", "D": "646"},
 "correct_answer": "B"},

{"id": 59, "difficulty": "hard",
 "question": "What is 999 - 111?",
 "options": {"A": "878", "B": "898", "C": "888", "D": "908"},
 "correct_answer": "C"},

{"id": 60, "difficulty": "hard",
 "question": "Solve: 1000 - 1000",
 "options": {"A": "10", "B": "0", "C": "-10", "D": "20"},
 "correct_answer": "D"}
  ]
}