fact-family/mixed-within-20-fill-blanks · 套题 78
5 problems
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1
Write the fact family for 9, 10, 19:
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2
Write the fact family for 16, 3, 19:
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3
Write the fact family for 6, 13, 19:
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4
Write the fact family for 19, 1, 20:
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5
Write the fact family for 12, 3, 15:
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