fact-family/add-sub-within-20-write-all · 套题 72
6 problems
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1
Write the fact family for 2, 2, 4:
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2
Write the fact family for 6, 1, 7:
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3
Write the fact family for 13, 5, 18:
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4
Write the fact family for 2, 17, 19:
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5
Write the fact family for 1, 15, 16:
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6
Write the fact family for 11, 4, 15:
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