fact-family/mixed-within-20-write-all · 套题 25
6 problems
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1
Write the fact family for 17, 1, 18:
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2
Write the fact family for 7, 2, 9:
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3
Write the fact family for 6, 6, 12:
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4
Write the fact family for 15, 3, 18:
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5
Write the fact family for 7, 8, 15:
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6
Write the fact family for 10, 1, 11:
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