fact-family/add-sub-within-20-fill-blanks · 套题 67
6 problems
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1
Write the fact family for 6, 6, 12:
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2
Write the fact family for 5, 15, 20:
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3
Write the fact family for 5, 10, 15:
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4
Write the fact family for 18, 1, 19:
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5
Write the fact family for 5, 1, 6:
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6
Write the fact family for 19, 1, 20:
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