fact-family/add-sub-within-20/easy · セット 15
6 problems
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日付：
1
Write the fact family for 12, 6, 18:
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2
Write the fact family for 14, 2, 16:
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3
Write the fact family for 19, 1, 20:
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4
Write the fact family for 5, 1, 6:
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5
Write the fact family for 11, 6, 17:
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6
Write the fact family for 10, 1, 11:
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