fact-family/add-sub-within-20/easy · セット 93
6 problems
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日付：
1
Write the fact family for 6, 9, 15:
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2
Write the fact family for 10, 8, 18:
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3
Write the fact family for 5, 3, 8:
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4
Write the fact family for 2, 12, 14:
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5
Write the fact family for 9, 11, 20:
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6
Write the fact family for 16, 2, 18:
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