{
  "title": "Subtraction - 3-Digit Subtraction",
  "total_questions": 60,
  "questions": [
    {
      "id": 1,
      "difficulty": "easy",
      "question": "345 − 123",
      "options": { "A": "222", "B": "223", "C": "221", "D": "224" },
      "correct_answer": "A"
    },
    {
      "id": 2,
      "difficulty": "easy",
      "question": "420 − 210",
      "options": {
        "A": "220",
        "B": "210",
        "C": "200",
        "D": "230"
      },
      "correct_answer": "B"
    },
    {
      "id": 3,
      "difficulty": "easy",
      "question": "500 − 200",
      "options": { "A": "200", "B": "300", "C": "250", "D": "400" },
      "correct_answer": "B"
    },
    {
      "id": 4,
      "difficulty": "easy",
      "question": "631 − 321",
      "options": { "A": "310", "B": "311", "C": "312", "D": "309" },
      "correct_answer": "A"
    },
    {
      "id": 5,
      "difficulty": "easy",
      "question": "480 − 120",
      "options": { "A": "360", "B": "350", "C": "300", "D": "370" },
      "correct_answer": "A"
    },
    {
      "id": 6,
      "difficulty": "easy",
      "question": "750 − 250",
      "options": { "A": "400", "B": "500", "C": "450", "D": "350" },
      "correct_answer": "B"
    },
    {
      "id": 7,
      "difficulty": "easy",
      "question": "920 − 410",
      "options": { "A": "520", "B": "510", "C": "500", "D": "530" },
      "correct_answer": "B"
    },
    {
      "id": 8,
      "difficulty": "easy",
      "question": "333 − 111",
      "options": { "A": "222", "B": "221", "C": "223", "D": "224" },
      "correct_answer": "A"
    },
    {
      "id": 9,
      "difficulty": "easy",
      "question": "640 − 320",
      "options": { "A": "320", "B": "300", "C": "310", "D": "330" },
      "correct_answer": "A"
    },
    {
      "id": 10,
      "difficulty": "easy",
      "question": "850 − 430",
      "options": { "A": "420", "B": "410", "C": "400", "D": "430" },
      "correct_answer": "A"
    },
    {
      "id": 11,
      "difficulty": "easy",
      "question": "712 − 300",
      "options": { "A": "412", "B": "422", "C": "402", "D": "410" },
      "correct_answer": "A"
    },
    {
      "id": 12,
      "difficulty": "easy",
      "question": "900 − 450",
      "options": { "A": "460", "B": "450", "C": "440", "D": "420" },
      "correct_answer": "B"
    },
    {
      "id": 13,
      "difficulty": "easy",
      "question": "680 − 240",
      "options": { "A": "440", "B": "430", "C": "450", "D": "460" },
      "correct_answer": "A"
    },
    {
      "id": 14,
      "difficulty": "easy",
      "question": "721 − 121",
      "options": {
        "A": "500",
        "B": "600",
        "C": "550",
        "D": "520"
      },
      "correct_answer": "B"
    },
    {
      "id": 15,
      "difficulty": "easy",
      "question": "540 − 230",
      "options": { "A": "320", "B": "310", "C": "300", "D": "330" },
      "correct_answer": "B"
    },
    {
      "id": 16,
      "difficulty": "easy",
      "question": "810 − 320",
      "options": { "A": "500", "B": "480", "C": "490", "D": "520" },
      "correct_answer": "C"
    },
    {
      "id": 17,
      "difficulty": "easy",
      "question": "600 − 150",
      "options": { "A": "450", "B": "400", "C": "420", "D": "440" },
      "correct_answer": "A"
    },
    {
      "id": 18,
      "difficulty": "easy",
      "question": "723 − 223",
      "options": { "A": "400", "B": "500", "C": "600", "D": "450" },
      "correct_answer": "B"
    },
    {
      "id": 19,
      "difficulty": "easy",
      "question": "510 − 210",
      "options": { "A": "320", "B": "300", "C": "310", "D": "290" },
      "correct_answer": "B"
    },
    {
      "id": 20,
      "difficulty": "easy",
      "question": "760 − 330",
      "options": { "A": "440", "B": "430", "C": "420", "D": "450" },
      "correct_answer": "B"
    },

    {
      "id": 21,
      "difficulty": "medium",
      "question": "523 − 214",
      "options": { "A": "309", "B": "311", "C": "319", "D": "303" },
      "correct_answer": "A"
    },
    {
      "id": 22,
      "difficulty": "medium",
      "question": "674 − 352",
      "options": { "A": "312", "B": "322", "C": "324", "D": "334" },
      "correct_answer": "B"
    },
    {
      "id": 23,
      "difficulty": "medium",
      "question": "741 − 128",
      "options": { "A": "613", "B": "612", "C": "622", "D": "611" },
      "correct_answer": "A"
    },
    {
      "id": 24,
      "difficulty": "medium",
      "question": "856 − 437",
      "options": { "A": "419", "B": "420", "C": "418", "D": "417" },
      "correct_answer": "A"
    },
    {
      "id": 25,
      "difficulty": "medium",
      "question": "903 − 225",
      "options": { "A": "678", "B": "688", "C": "680", "D": "676" },
      "correct_answer": "A"
    },
    {
      "id": 26,
      "difficulty": "medium",
      "question": "725 − 314",
      "options": { "A": "421", "B": "411", "C": "410", "D": "420" },
      "correct_answer": "B"
    },
    {
      "id": 27,
      "difficulty": "medium",
      "question": "612 − 287",
      "options": { "A": "325", "B": "326", "C": "327", "D": "324" },
      "correct_answer": "A"
    },
    {
      "id": 28,
      "difficulty": "medium",
      "question": "784 − 365",
      "options": { "A": "429", "B": "419", "C": "420", "D": "421" },
      "correct_answer": "B"
    },
    {
      "id": 29,
      "difficulty": "medium",
      "question": "659 − 328",
      "options": { "A": "321", "B": "331", "C": "341", "D": "329" },
      "correct_answer": "B"
    },
    {
      "id": 30,
      "difficulty": "medium",
      "question": "832 − 419",
      "options": { "A": "413", "B": "412", "C": "421", "D": "411" },
      "correct_answer": "A"
    },
    {
      "id": 31,
      "difficulty": "medium",
      "question": "703 − 286",
      "options": { "A": "417", "B": "416", "C": "426", "D": "423" },
      "correct_answer": "A"
    },
    {
      "id": 32,
      "difficulty": "medium",
      "question": "945 − 427",
      "options": {
        "A": "528",
        "B": "518",
        "C": "517",
        "D": "519"
      },
      "correct_answer": "B"
    },
    {
      "id": 33,
      "difficulty": "medium",
      "question": "820 − 465",
      "options": { "A": "355", "B": "345", "C": "354", "D": "356" },
      "correct_answer": "A"
    },
    {
      "id": 34,
      "difficulty": "medium",
      "question": "751 − 329",
      "options": { "A": "425", "B": "422", "C": "423", "D": "421" },
      "correct_answer": "B"
    },
    {
      "id": 35,
      "difficulty": "medium",
      "question": "640 − 289",
      "options": { "A": "351", "B": "331", "C": "341", "D": "350" },
      "correct_answer": "A"
    },
    {
      "id": 36,
      "difficulty": "medium",
      "question": "902 − 578",
      "options": { "A": "334", "B": "324", "C": "314", "D": "344" },
      "correct_answer": "B"
    },
    {
      "id": 37,
      "difficulty": "medium",
      "question": "788 − 369",
      "options": { "A": "419", "B": "420", "C": "421", "D": "422" },
      "correct_answer": "A"
    },
    {
      "id": 38,
      "difficulty": "medium",
      "question": "951 − 428",
      "options": { "A": "523", "B": "513", "C": "533", "D": "522" },
      "correct_answer": "A"
    },
    {
      "id": 39,
      "difficulty": "medium",
      "question": "873 − 456",
      "options": { "A": "427", "B": "417", "C": "437", "D": "426" },
      "correct_answer": "B"
    },
    {
      "id": 40,
      "difficulty": "medium",
      "question": "804 − 275",
      "options": {
        "A": "529",
        "B": "539",
        "C": "519",
        "D": "528"
      },
      "correct_answer": "A"
    },
    {
      "id": 41,
      "difficulty": "hard",
      "question": "843 − 567",
      "options": {
        "A": "286",
        "B": "276",
        "C": "296",
        "D": "266"
      },
      "correct_answer": "B"
    },
    {
      "id": 42,
      "difficulty": "hard",
      "question": "952 − 478",
      "options": { "A": "474", "B": "472", "C": "484", "D": "462" },
      "correct_answer": "A"
    },
    {
      "id": 43,
      "difficulty": "hard",
      "question": "761 − 389",
      "options": {
        "A": "372",
        "B": "371",
        "C": "382",
        "D": "362"
      },
      "correct_answer": "A"
    },
    {
      "id": 44,
      "difficulty": "hard",
      "question": "803 − 459",
      "options": { "A": "354", "B": "344", "C": "343", "D": "345" },
      "correct_answer": "B"
    },
    {
      "id": 45,
      "difficulty": "hard",
      "question": "924 − 547",
      "options": { "A": "377", "B": "367", "C": "387", "D": "357" },
      "correct_answer": "A"
    },
    {
      "id": 46,
      "difficulty": "hard",
      "question": "675 − 389",
      "options": { "A": "286", "B": "287", "C": "296", "D": "298" },
      "correct_answer": "A"
    },
    {
      "id": 47,
      "difficulty": "hard",
      "question": "748 − 469",
      "options": { "A": "279", "B": "289", "C": "281", "D": "271" },
      "correct_answer": "A"
    },
    {
      "id": 48,
      "difficulty": "hard",
      "question": "902 − 658",
      "options": { "A": "254", "B": "244", "C": "242", "D": "252" },
      "correct_answer": "B"
    },
    {
      "id": 49,
      "difficulty": "hard",
      "question": "731 − 489",
      "options": { "A": "232", "B": "241", "C": "242", "D": "231" },
      "correct_answer": "C"
    },
    {
      "id": 50,
      "difficulty": "hard",
      "question": "861 − 579",
      "options": { "A": "292", "B": "282", "C": "296", "D": "291" },
      "correct_answer": "B"
    },
    {
      "id": 51,
      "difficulty": "hard",
      "question": "719 − 458",
      "options": { "A": "271", "B": "261", "C": "259", "D": "251" },
      "correct_answer": "B"
    },
    {
      "id": 52,
      "difficulty": "hard",
      "question": "907 − 689",
      "options": { "A": "228", "B": "217", "C": "218", "D": "219" },
      "correct_answer": "C"
    },
    {
      "id": 53,
      "difficulty": "hard",
      "question": "864 − 579",
      "options": { "A": "295", "B": "285", "C": "286", "D": "296" },
      "correct_answer": "B"
    },
    {
      "id": 54,
      "difficulty": "hard",
      "question": "753 − 468",
      "options": { "A": "295", "B": "285", "C": "283", "D": "289" },
      "correct_answer": "B"
    },
    {
      "id": 55,
      "difficulty": "hard",
      "question": "681 − 394",
      "options": { "A": "297", "B": "287", "C": "285", "D": "289" },
      "correct_answer": "B"
    },
    {
      "id": 56,
      "difficulty": "hard",
      "question": "734 − 458",
      "options": { "A": "286", "B": "276", "C": "278", "D": "284" },
      "correct_answer": "B"
    },
    {
      "id": 57,
      "difficulty": "hard",
      "question": "902 − 487",
      "options": { "A": "425", "B": "415", "C": "435", "D": "417" },
      "correct_answer": "B"
    },
    {
      "id": 58,
      "difficulty": "hard",
      "question": "615 − 369",
      "options": { "A": "246", "B": "256", "C": "248", "D": "249" },
      "correct_answer": "A"
    },
    {
      "id": 59,
      "difficulty": "hard",
      "question": "847 − 568",
      "options": { "A": "279", "B": "289", "C": "281", "D": "291" },
      "correct_answer": "A"
    },
    {
      "id": 60,
      "difficulty": "hard",
      "question": "951 − 678",
      "options": { "A": "283", "B": "273", "C": "275", "D": "281" },
      "correct_answer": "B"
    }
  ]
}