fact-family/add-sub-within-20/hard · セット 38
6 problems
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日付：
1
Write the fact family for 10, 6, 16:
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2
Write the fact family for 2, 14, 16:
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3
Write the fact family for 7, 11, 77:
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4
Write the fact family for 11, 8, 88:
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5
Write the fact family for 11, 10, 110:
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6
Write the fact family for 4, 5, 20:
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