{
  "title": "Subtraction - 2-digit without borrow",
  "total_questions": 60,
  "questions": [
    {
      "id": 1,
      "difficulty": "easy",
      "question": "45 − 23",
      "options": { "A": "21", "B": "22", "C": "20", "D": "19" },
      "correct_answer": "B"
    },
    {
      "id": 2,
      "difficulty": "easy",
      "question": "68 − 24",
      "options": { "A": "44", "B": "43", "C": "42", "D": "45" },
      "correct_answer": "A"
    },
    {
      "id": 3,
      "difficulty": "easy",
      "question": "57 − 12",
      "options": { "A": "45", "B": "44", "C": "46", "D": "47" },
      "correct_answer": "A"
    },
    {
      "id": 4,
      "difficulty": "easy",
      "question": "39 − 17",
      "options": { "A": "23", "B": "22", "C": "21", "D": "24" },
      "correct_answer": "B"
    },
    {
      "id": 5,
      "difficulty": "easy",
      "question": "46 − 25",
      "options": { "A": "22", "B": "20", "C": "21", "D": "19" },
      "correct_answer": "C"
    },
    {
      "id": 6,
      "difficulty": "easy",
      "question": "58 − 36",
      "options": { "A": "20", "B": "21", "C": "22", "D": "24" },
      "correct_answer": "C"
    },
    {
      "id": 7,
      "difficulty": "easy",
      "question": "34 − 12",
      "options": { "A": "23", "B": "22", "C": "21", "D": "24" },
      "correct_answer": "B"
    },
    {
      "id": 8,
      "difficulty": "easy",
      "question": "77 − 33",
      "options": { "A": "44", "B": "43", "C": "45", "D": "46" },
      "correct_answer": "A"
    },
    {
      "id": 9,
      "difficulty": "easy",
      "question": "66 − 44",
      "options": { "A": "23", "B": "21", "C": "22", "D": "20" },
      "correct_answer": "C"
    },
    {
      "id": 10,
      "difficulty": "easy",
      "question": "59 − 28",
      "options": { "A": "31", "B": "33", "C": "32", "D": "34" },
      "correct_answer": "A"
    },
    {
      "id": 11,
      "difficulty": "easy",
      "question": "48 − 26",
      "options": { "A": "23", "B": "22", "C": "21", "D": "24" },
      "correct_answer": "B"
    },
    {
      "id": 12,
      "difficulty": "easy",
      "question": "72 − 21",
      "options": { "A": "50", "B": "51", "C": "52", "D": "53" },
      "correct_answer": "B"
    },
    {
      "id": 13,
      "difficulty": "easy",
      "question": "55 − 33",
      "options": { "A": "22", "B": "23", "C": "21", "D": "24" },
      "correct_answer": "A"
    },
    {
      "id": 14,
      "difficulty": "easy",
      "question": "64 − 42",
      "options": { "A": "22", "B": "21", "C": "20", "D": "23" },
      "correct_answer": "A"
    },
    {
      "id": 15,
      "difficulty": "easy",
      "question": "81 − 30",
      "options": { "A": "51", "B": "50", "C": "52", "D": "60" },
      "correct_answer": "A"
    },
    {
      "id": 16,
      "difficulty": "easy",
      "question": "73 − 52",
      "options": { "A": "21", "B": "22", "C": "23", "D": "20" },
      "correct_answer": "A"
    },
    {
      "id": 17,
      "difficulty": "easy",
      "question": "92 − 41",
      "options": { "A": "50", "B": "51", "C": "52", "D": "53" },
      "correct_answer": "B"
    },
    {
      "id": 18,
      "difficulty": "easy",
      "question": "84 − 23",
      "options": { "A": "61", "B": "62", "C": "63", "D": "64" },
      "correct_answer": "A"
    },
    {
      "id": 19,
      "difficulty": "easy",
      "question": "57 − 34",
      "options": { "A": "23", "B": "24", "C": "22", "D": "25" },
      "correct_answer": "A"
    },
    {
      "id": 20,
      "difficulty": "easy",
      "question": "90 − 40",
      "options": { "A": "60", "B": "55", "C": "50", "D": "70" },
      "correct_answer": "C"
    },

    {
      "id": 21,
      "difficulty": "medium",
      "question": "64 − 22",
      "options": { "A": "42", "B": "41", "C": "40", "D": "44" },
      "correct_answer": "A"
    },
    {
      "id": 22,
      "difficulty": "medium",
      "question": "53 − 21",
      "options": { "A": "31", "B": "32", "C": "33", "D": "30" },
      "correct_answer": "B"
    },
    {
      "id": 23,
      "difficulty": "medium",
      "question": "75 − 34",
      "options": { "A": "42", "B": "41", "C": "43", "D": "44" },
      "correct_answer": "B"
    },
    {
      "id": 24,
      "difficulty": "medium",
      "question": "86 − 33",
      "options": { "A": "55", "B": "53", "C": "56", "D": "52" },
      "correct_answer": "B"
    },
    {
      "id": 25,
      "difficulty": "medium",
      "question": "48 − 26",
      "options": { "A": "22", "B": "21", "C": "23", "D": "24" },
      "correct_answer": "A"
    },
    {
      "id": 26,
      "difficulty": "medium",
      "question": "92 − 51",
      "options": { "A": "51", "B": "41", "C": "52", "D": "50" },
      "correct_answer": "B"
    },
    {
      "id": 27,
      "difficulty": "medium",
      "question": "67 − 45",
      "options": { "A": "23", "B": "24", "C": "21", "D": "22" },
      "correct_answer": "D"
    },
    {
      "id": 28,
      "difficulty": "medium",
      "question": "84 − 23",
      "options": { "A": "61", "B": "62", "C": "60", "D": "63" },
      "correct_answer": "A"
    },
    {
      "id": 29,
      "difficulty": "medium",
      "question": "73 − 31",
      "options": { "A": "41", "B": "42", "C": "43", "D": "44" },
      "correct_answer": "B"
    },
    {
      "id": 30,
      "difficulty": "medium",
      "question": "59 − 37",
      "options": { "A": "23", "B": "22", "C": "21", "D": "24" },
      "correct_answer": "B"
    },
    {
      "id": 31,
      "difficulty": "medium",
      "question": "66 − 33",
      "options": { "A": "33", "B": "34", "C": "32", "D": "35" },
      "correct_answer": "A"
    },
    {
      "id": 32,
      "difficulty": "medium",
      "question": "54 − 22",
      "options": { "A": "31", "B": "32", "C": "33", "D": "34" },
      "correct_answer": "B"
    },
    {
      "id": 33,
      "difficulty": "medium",
      "question": "88 − 44",
      "options": { "A": "44", "B": "45", "C": "46", "D": "42" },
      "correct_answer": "A"
    },
    {
      "id": 34,
      "difficulty": "medium",
      "question": "77 − 55",
      "options": { "A": "23", "B": "24", "C": "22", "D": "21" },
      "correct_answer": "C"
    },
    {
      "id": 35,
      "difficulty": "medium",
      "question": "95 − 52",
      "options": { "A": "44", "B": "43", "C": "42", "D": "40" },
      "correct_answer": "B"
    },
    {
      "id": 36,
      "difficulty": "medium",
      "question": "42 − 21",
      "options": { "A": "20", "B": "21", "C": "22", "D": "23" },
      "correct_answer": "B"
    },
    {
      "id": 37,
      "difficulty": "medium",
      "question": "74 − 23",
      "options": { "A": "50", "B": "51", "C": "52", "D": "53" },
      "correct_answer": "B"
    },
    {
      "id": 38,
      "difficulty": "medium",
      "question": "63 − 41",
      "options": { "A": "23", "B": "22", "C": "21", "D": "20" },
      "correct_answer": "B"
    },
    {
      "id": 39,
      "difficulty": "medium",
      "question": "58 − 26",
      "options": { "A": "32", "B": "33", "C": "31", "D": "30" },
      "correct_answer": "A"
    },
    {
      "id": 40,
      "difficulty": "medium",
      "question": "79 − 57",
      "options": { "A": "23", "B": "21", "C": "22", "D": "20" },
      "correct_answer": "C"
    },

    {
      "id": 41,
      "difficulty": "hard",
      "question": "74 − 42",
      "options": { "A": "34", "B": "32", "C": "33", "D": "31" },
      "correct_answer": "B"
    },
    {
      "id": 42,
      "difficulty": "hard",
      "question": "68 − 45",
      "options": { "A": "23", "B": "24", "C": "22", "D": "21" },
      "correct_answer": "A"
    },
    {
      "id": 43,
      "difficulty": "hard",
      "question": "57 − 34",
      "options": { "A": "23", "B": "24", "C": "22", "D": "25" },
      "correct_answer": "A"
    },
    {
      "id": 44,
      "difficulty": "hard",
      "question": "96 − 53",
      "options": { "A": "44", "B": "42", "C": "43", "D": "41" },
      "correct_answer": "C"
    },
    {
      "id": 45,
      "difficulty": "hard",
      "question": "85 − 64",
      "options": { "A": "11", "B": "21", "C": "20", "D": "22" },
      "correct_answer": "B"
    },
    {
      "id": 46,
      "difficulty": "hard",
      "question": "93 − 51",
      "options": { "A": "41", "B": "42", "C": "43", "D": "44" },
      "correct_answer": "B"
    },
    {
      "id": 47,
      "difficulty": "hard",
      "question": "78 − 56",
      "options": { "A": "21", "B": "22", "C": "23", "D": "24" },
      "correct_answer": "B"
    },
    {
      "id": 48,
      "difficulty": "hard",
      "question": "69 − 47",
      "options": { "A": "23", "B": "21", "C": "22", "D": "24" },
      "correct_answer": "C"
    },
    {
      "id": 49,
      "difficulty": "hard",
      "question": "58 − 36",
      "options": { "A": "22", "B": "21", "C": "23", "D": "24" },
      "correct_answer": "A"
    },
    {
      "id": 50,
      "difficulty": "hard",
      "question": "84 − 61",
      "options": { "A": "22", "B": "23", "C": "24", "D": "20" },
      "correct_answer": "B"
    },
    {
      "id": 51,
      "difficulty": "hard",
      "question": "73 − 52",
      "options": { "A": "21", "B": "22", "C": "23", "D": "20" },
      "correct_answer": "A"
    },
    {
      "id": 52,
      "difficulty": "hard",
      "question": "92 − 40",
      "options": { "A": "52", "B": "50", "C": "51", "D": "53" },
      "correct_answer": "A"
    },
    {
      "id": 53,
      "difficulty": "hard",
      "question": "67 − 25",
      "options": { "A": "40", "B": "42", "C": "41", "D": "39" },
      "correct_answer": "B"
    },
    {
      "id": 54,
      "difficulty": "hard",
      "question": "88 − 66",
      "options": { "A": "22", "B": "11", "C": "21", "D": "20" },
      "correct_answer": "A"
    },
    {
      "id": 55,
      "difficulty": "hard",
      "question": "95 − 73",
      "options": { "A": "12", "B": "21", "C": "22", "D": "23" },
      "correct_answer": "C"
    },
    {
      "id": 56,
      "difficulty": "hard",
      "question": "72 − 41",
      "options": { "A": "31", "B": "30", "C": "32", "D": "29" },
      "correct_answer": "A"
    },
    {
      "id": 57,
      "difficulty": "hard",
      "question": "69 − 48",
      "options": { "A": "20", "B": "22", "C": "21", "D": "23" },
      "correct_answer": "C"
    },
    {
      "id": 58,
      "difficulty": "hard",
      "question": "83 − 62",
      "options": { "A": "22", "B": "21", "C": "23", "D": "24" },
      "correct_answer": "B"
    },
    {
      "id": 59,
      "difficulty": "hard",
      "question": "77 − 44",
      "options": { "A": "33", "B": "31", "C": "32", "D": "30" },
      "correct_answer": "A"
    },
    {
      "id": 60,
      "difficulty": "hard",
      "question": "58 − 27",
      "options": { "A": "30", "B": "31", "C": "32", "D": "33" },
      "correct_answer": "B"
    }
  ]
}