fact-family/add-sub-within-10/expert · 套题 76
6 problems
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1
Write the fact family for 5, 3, 15:
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2
Write the fact family for 3, 7, 21:
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3
Write the fact family for 2, 1, 3:
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4
Write the fact family for 8, 2, 16:
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5
Write the fact family for 3, 5, 15:
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6
Write the fact family for 8, 3, 24:
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