medium Set 50 Form Exercise

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    "operation": "counting",
    "subject": "arithmetic",
    "difficulty": "medium",
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        "_gradeLevel": "2"
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    "problems": [
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            "id": 1,
            "type": "counting",
            "subType": "count-objects",
            "question": "Count the flowers: How many are there? (28 flowers)",
            "answer": 28,
            "correctAnswer": "28",
            "difficulty": "normal"
        },
        {
            "id": 2,
            "type": "counting",
            "subType": "count-objects",
            "question": "Count the dots: How many are there? (95 dots)",
            "answer": 95,
            "correctAnswer": "95",
            "difficulty": "normal"
        },
        {
            "id": 3,
            "type": "counting",
            "subType": "skip-counting",
            "question": "What is the next number in the sequence? 36, __, 40, 42, 44",
            "answer": 38,
            "correctAnswer": "38",
            "difficulty": "normal"
        },
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            "id": 4,
            "type": "counting",
            "subType": "count-objects",
            "question": "Count the flowers: How many are there? (38 flowers)",
            "answer": 38,
            "correctAnswer": "38",
            "difficulty": "normal"
        },
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            "id": 5,
            "type": "counting",
            "subType": "skip-counting",
            "question": "What is the next number in the sequence? 27, 30, 33, __, 39",
            "answer": 36,
            "correctAnswer": "36",
            "difficulty": "normal"
        },
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            "id": 6,
            "type": "counting",
            "subType": "skip-counting",
            "question": "What is the next number in the sequence? 20, 30, __, 50, 60",
            "answer": 40,
            "correctAnswer": "40",
            "difficulty": "normal"
        },
        {
            "id": 7,
            "type": "counting",
            "subType": "what-comes-next",
            "question": "What comes after 68?",
            "answer": 69,
            "correctAnswer": "69",
            "difficulty": "normal"
        },
        {
            "id": 8,
            "type": "counting",
            "subType": "count-objects",
            "question": "Count the stars: How many are there? (75 stars)",
            "answer": 75,
            "correctAnswer": "75",
            "difficulty": "normal"
        },
        {
            "id": 9,
            "type": "counting",
            "subType": "count-by",
            "question": "Count by 3s: 39, 42, 45, 48, __",
            "answer": 51,
            "correctAnswer": "51",
            "difficulty": "normal"
        },
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            "id": 10,
            "type": "counting",
            "subType": "count-by",
            "question": "Count by 2s: 34, 36, 38, 40, __",
            "answer": 42,
            "correctAnswer": "42",
            "difficulty": "normal"
        },
        {
            "id": 11,
            "type": "counting",
            "subType": "count-objects",
            "question": "Count the hearts: How many are there? (3 hearts)",
            "answer": 3,
            "correctAnswer": "3",
            "difficulty": "normal"
        },
        {
            "id": 12,
            "type": "counting",
            "subType": "what-comes-next",
            "question": "What comes after 50?",
            "answer": 51,
            "correctAnswer": "51",
            "difficulty": "normal"
        },
        {
            "id": 13,
            "type": "counting",
            "subType": "count-by",
            "question": "Count by 5s: 10, 15, 20, 25, __",
            "answer": 30,
            "correctAnswer": "30",
            "difficulty": "normal"
        },
        {
            "id": 14,
            "type": "counting",
            "subType": "what-comes-next",
            "question": "What comes after 49?",
            "answer": 50,
            "correctAnswer": "50",
            "difficulty": "normal"
        },
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            "id": 15,
            "type": "counting",
            "subType": "skip-counting",
            "question": "What is the next number in the sequence? 50, __, 60, 65, 70",
            "answer": 55,
            "correctAnswer": "55",
            "difficulty": "normal"
        },
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            "id": 16,
            "type": "counting",
            "subType": "count-objects",
            "question": "Count the hearts: How many are there? (78 hearts)",
            "answer": 78,
            "correctAnswer": "78",
            "difficulty": "normal"
        },
        {
            "id": 17,
            "type": "counting",
            "subType": "what-comes-next",
            "question": "What comes after 4?",
            "answer": 5,
            "correctAnswer": "5",
            "difficulty": "normal"
        },
        {
            "id": 18,
            "type": "counting",
            "subType": "count-by",
            "question": "Count by 10s: 40, 50, 60, 70, __",
            "answer": 80,
            "correctAnswer": "80",
            "difficulty": "normal"
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            "type": "counting",
            "subType": "what-comes-next",
            "question": "What comes after 40?",
            "answer": 41,
            "correctAnswer": "41",
            "difficulty": "normal"
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            "id": 20,
            "type": "counting",
            "subType": "what-comes-next",
            "question": "What comes after 33?",
            "answer": 34,
            "correctAnswer": "34",
            "difficulty": "normal"
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