fact-family/add-sub-within-20/hard · 套题 94
6 problems
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1
Write the fact family for 15, 1, 16:
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2
Write the fact family for 14, 3, 17:
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3
Write the fact family for 6, 4, 10:
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4
Write the fact family for 4, 5, 9:
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5
Write the fact family for 17, 1, 18:
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6
Write the fact family for 3, 3, 9:
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