fact-family/add-sub-within-20/easy · 套题 18
6 problems
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1
Write the fact family for 14, 4, 18:
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2
Write the fact family for 9, 6, 15:
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3
Write the fact family for 5, 9, 14:
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4
Write the fact family for 11, 6, 17:
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5
Write the fact family for 3, 13, 16:
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6
Write the fact family for 3, 15, 18:
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