fact-family/add-sub-within-20-write-all · 套题 55
6 problems
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1
Write the fact family for 7, 8, 15:
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2
Write the fact family for 4, 15, 19:
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3
Write the fact family for 12, 2, 14:
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4
Write the fact family for 17, 2, 19:
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5
Write the fact family for 10, 3, 13:
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6
Write the fact family for 7, 3, 10:
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