fact-family/add-sub-within-20/medium · 套题 29
6 problems
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1
Write the fact family for 11, 6, 17:
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2
Write the fact family for 6, 6, 12:
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3
Write the fact family for 11, 9, 20:
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4
Write the fact family for 5, 10, 50:
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5
Write the fact family for 2, 12, 14:
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6
Write the fact family for 10, 7, 70:
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