fact-family/add-sub-within-20/hard · 套题 20
6 problems
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1
Write the fact family for 11, 5, 55:
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2
Write the fact family for 7, 4, 28:
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3
Write the fact family for 6, 9, 54:
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4
Write the fact family for 12, 8, 20:
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5
Write the fact family for 11, 1, 12:
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6
Write the fact family for 9, 7, 16:
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