fact-family/add-sub-within-20/easy · 套题 19
6 problems
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1
Write the fact family for 6, 8, 14:
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2
Write the fact family for 2, 3, 5:
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3
Write the fact family for 9, 7, 16:
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4
Write the fact family for 8, 7, 15:
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5
Write the fact family for 1, 18, 19:
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6
Write the fact family for 3, 9, 12:
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