fact-family/add-sub-within-20/hard · 套题 72
6 problems
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1
Write the fact family for 12, 7, 19:
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2
Write the fact family for 14, 2, 16:
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3
Write the fact family for 11, 7, 18:
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4
Write the fact family for 4, 11, 44:
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5
Write the fact family for 18, 2, 20:
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6
Write the fact family for 7, 10, 70:
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