fact-family/mixed-within-20-fill-blanks · 套题 55
5 problems
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1
Write the fact family for 5, 15, 20:
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2
Write the fact family for 2, 11, 13:
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3
Write the fact family for 19, 1, 20:
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4
Write the fact family for 17, 3, 20:
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5
Write the fact family for 15, 1, 16:
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