fact-family/add-sub-within-20/easy · 套题 73
6 problems
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1
Write the fact family for 17, 3, 20:
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2
Write the fact family for 10, 5, 15:
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3
Write the fact family for 19, 1, 20:
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4
Write the fact family for 12, 2, 14:
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5
Write the fact family for 8, 8, 16:
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6
Write the fact family for 5, 6, 11:
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