fact-family/add-sub-within-20/easy · 套题 34
5 problems
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1
Write the fact family for 18, 1, 19:
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2
Write the fact family for 13, 5, 18:
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3
Write the fact family for 13, 6, 19:
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4
Write the fact family for 9, 7, 16:
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5
Write the fact family for 10, 8, 18:
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