fact-family/add-sub-within-20-fill-blanks · 套题 49
6 problems
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1
Write the fact family for 10, 9, 19:
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2
Write the fact family for 15, 3, 18:
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3
Write the fact family for 16, 4, 20:
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4
Write the fact family for 10, 1, 11:
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5
Write the fact family for 8, 12, 20:
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6
Write the fact family for 12, 1, 13:
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