fact-family/add-sub-within-20/easy · 套题 25
6 problems
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1
Write the fact family for 11, 9, 20:
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2
Write the fact family for 2, 10, 12:
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3
Write the fact family for 5, 2, 7:
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4
Write the fact family for 5, 15, 20:
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5
Write the fact family for 1, 19, 20:
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6
Write the fact family for 2, 7, 9:
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