fact-family/add-sub-within-20/hard · セット 34
6 problems
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日付：
1
Write the fact family for 2, 10, 20:
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2
Write the fact family for 10, 11, 110:
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3
Write the fact family for 9, 3, 27:
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4
Write the fact family for 1, 19, 20:
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5
Write the fact family for 9, 9, 81:
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6
Write the fact family for 15, 1, 16:
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