fact-family/mixed-within-20-write-all · 套题 17
6 problems
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1
Write the fact family for 15, 5, 20:
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2
Write the fact family for 2, 11, 13:
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3
Write the fact family for 4, 8, 12:
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4
Write the fact family for 3, 4, 7:
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5
Write the fact family for 17, 3, 20:
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6
Write the fact family for 5, 8, 13:
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