fact-family/mixed-within-20-fill-blanks · 套题 77
6 problems
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1
Write the fact family for 3, 9, 12:
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2
Write the fact family for 10, 8, 18:
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3
Write the fact family for 17, 1, 18:
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4
Write the fact family for 16, 4, 20:
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5
Write the fact family for 11, 6, 17:
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6
Write the fact family for 14, 3, 17:
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