fact-family/add-sub-within-20/hard · 套题 25
6 problems
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1
Write the fact family for 7, 4, 11:
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2
Write the fact family for 13, 4, 17:
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3
Write the fact family for 17, 3, 20:
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4
Write the fact family for 10, 2, 20:
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5
Write the fact family for 5, 8, 13:
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6
Write the fact family for 12, 9, 108:
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