fact-family/mixed-within-20-write-all · 套题 49
6 problems
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1
Write the fact family for 5, 1, 6:
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2
Write the fact family for 2, 7, 9:
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3
Write the fact family for 3, 4, 7:
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4
Write the fact family for 5, 12, 17:
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5
Write the fact family for 18, 2, 20:
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6
Write the fact family for 1, 8, 9:
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