fact-family/add-sub-within-20/hard · 套题 49
6 problems
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1
Write the fact family for 18, 1, 19:
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2
Write the fact family for 7, 4, 28:
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3
Write the fact family for 14, 4, 18:
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4
Write the fact family for 17, 3, 20:
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5
Write the fact family for 16, 2, 18:
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6
Write the fact family for 12, 7, 19:
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