fact-family/mixed-within-20-fill-blanks · 套题 23
6 problems
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1
Write the fact family for 1, 2, 3:
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2
Write the fact family for 13, 1, 14:
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3
Write the fact family for 5, 14, 19:
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4
Write the fact family for 15, 3, 18:
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5
Write the fact family for 18, 2, 20:
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6
Write the fact family for 5, 6, 11:
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