fact-family/add-sub-within-20-fill-blanks · 套题 37
6 problems
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1
Write the fact family for 3, 13, 16:
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2
Write the fact family for 19, 1, 20:
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3
Write the fact family for 5, 15, 20:
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4
Write the fact family for 1, 16, 17:
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5
Write the fact family for 16, 3, 19:
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6
Write the fact family for 4, 13, 17:
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