Subtraction Within 100 Medium — Set 100

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                "question": "37 - 31 = ___",
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                "question": "18 - 4 = ___",
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                "operand1": 64,
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                "answer": 6
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                "question": "73 - 52 = ___",
                "answer": 21
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                "operand2": 10,
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                "question": "17 - 10 = ___",
                "answer": 7
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                "operand1": 59,
                "operand2": 57,
                "operator": "-",
                "question": "59 - 57 = ___",
                "answer": 2
            },
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                "operand1": 97,
                "operand2": 45,
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                "question": "97 - 45 = ___",
                "answer": 52
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