fact-family/add-sub-within-20/hard · 套题 43
5 problems
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1
Write the fact family for 9, 9, 81:
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2
Write the fact family for 16, 1, 17:
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3
Write the fact family for 12, 8, 20:
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4
Write the fact family for 7, 9, 63:
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5
Write the fact family for 12, 8, 96:
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