fact-family/add-sub-within-20-fill-blanks · セット 21
6 problems
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1
Write the fact family for 7, 6, 13:
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2
Write the fact family for 1, 6, 7:
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3
Write the fact family for 11, 4, 15:
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4
Write the fact family for 19, 1, 20:
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5
Write the fact family for 10, 4, 14:
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6
Write the fact family for 11, 1, 12:
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