fact-family/add-sub-within-20-fill-blanks · 套题 43
6 problems
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1
Write the fact family for 6, 1, 7:
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2
Write the fact family for 1, 15, 16:
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3
Write the fact family for 13, 3, 16:
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4
Write the fact family for 14, 4, 18:
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5
Write the fact family for 10, 7, 17:
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6
Write the fact family for 4, 4, 8:
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