B Set 24 Unknown

This page uses a content type that does not have a custom renderer yet. Raw structured data is shown below.

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        "subject": "arithmetic",
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        "problems": [
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                "id": 1,
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                "operator": "-",
                "question": "64 - 51 = ___",
                "answer": 13
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            {
                "id": 2,
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                "operator": "-",
                "question": "15 - 13 = ___",
                "answer": 2
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                "operator": "-",
                "question": "99 - 27 = ___",
                "answer": 72
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            {
                "id": 4,
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                "operator": "-",
                "question": "96 - 13 = ___",
                "answer": 83
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            {
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                "operand1": 93,
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                "operator": "-",
                "question": "93 - 43 = ___",
                "answer": 50
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                "question": "29 - 19 = ___",
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                "question": "56 - 24 = ___",
                "answer": 32
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                "question": "68 - 42 = ___",
                "answer": 26
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                "id": 9,
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                "question": "12 - 10 = ___",
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                "question": "19 - 14 = ___",
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                "question": "56 - 45 = ___",
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                "id": 12,
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                "question": "53 - 32 = ___",
                "answer": 21
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                "question": "37 - 12 = ___",
                "answer": 25
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                "question": "13 - 10 = ___",
                "answer": 3
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                "operator": "-",
                "question": "44 - 42 = ___",
                "answer": 2
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            {
                "id": 17,
                "operand1": 55,
                "operand2": 10,
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                "question": "55 - 10 = ___",
                "answer": 45
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                "question": "67 - 45 = ___",
                "answer": 22
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                "question": "26 - 10 = ___",
                "answer": 16
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                "question": "94 - 51 = ___",
                "answer": 43
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    "_archetype": "form-exercise",
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