easy 4×4 Set 7 Form Exercise

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    "title": "form-exercise set 7",
    "operation": "math-bingo",
    "subject": "arithmetic",
    "difficulty": "easy",
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                    "problem": "5 × 5",
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                    "problem": "8 - 1",
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                    "problem": "8 - 2",
                    "answer": 6
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                {
                    "problem": "1 × 9",
                    "answer": 9
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                    "problem": "22 - 7",
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                {
                    "problem": "1 × 1",
                    "answer": 1
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                    "problem": "4 × 5",
                    "answer": 20
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                    "problem": "19 × 1",
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                    "problem": "43 - 13",
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                {
                    "problem": "2 × 7",
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                {
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                {
                    "problem": "7 + 10",
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                {
                    "problem": "1 + 9",
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                    "problem": "4 + 9",
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                {
                    "problem": "1 + 2",
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            "size": 5,
            "freeCenter": true,
            "question": "Mark answers on your bingo card as problems are called.",
            "correctAnswer": "bingo"
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