fact-family/add-sub-within-20/medium · 套题 15
6 problems
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1
Write the fact family for 12, 5, 60:
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2
Write the fact family for 3, 7, 21:
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3
Write the fact family for 10, 8, 80:
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4
Write the fact family for 3, 5, 15:
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5
Write the fact family for 9, 6, 54:
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6
Write the fact family for 9, 1, 10:
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