B Set 13 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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                "operator": "+",
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                "answer": 538
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            {
                "id": 2,
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                "operator": "+",
                "question": "1 + 168 = ___",
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                "operator": "+",
                "question": "240 + 23 = ___",
                "answer": 263
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                "operator": "+",
                "question": "7 + 92 = ___",
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                "question": "369 + 420 = ___",
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                "question": "3 + 786 = ___",
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                "operator": "+",
                "question": "117 + 42 = ___",
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                "id": 13,
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                "question": "260 + 213 = ___",
                "answer": 473
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                "question": "465 + 10 = ___",
                "answer": 475
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                "id": 17,
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                "question": "346 + 221 = ___",
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                "question": "67 + 21 = ___",
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                "operator": "+",
                "question": "401 + 38 = ___",
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