fact-family/add-sub-within-20/hard · 套题 91
6 problems
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1
Write the fact family for 4, 12, 48:
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2
Write the fact family for 2, 12, 24:
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3
Write the fact family for 1, 11, 12:
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4
Write the fact family for 11, 9, 20:
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5
Write the fact family for 9, 9, 81:
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6
Write the fact family for 5, 8, 40:
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