fact-family/add-sub-within-20/hard · 套题 82
6 problems
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1
Write the fact family for 4, 8, 32:
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2
Write the fact family for 6, 13, 19:
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3
Write the fact family for 3, 9, 12:
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4
Write the fact family for 3, 11, 14:
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5
Write the fact family for 17, 2, 19:
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6
Write the fact family for 7, 4, 28:
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