fact-family/add-sub-within-20/easy · セット 59
6 problems
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1
Write the fact family for 11, 4, 15:
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2
Write the fact family for 8, 10, 18:
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3
Write the fact family for 9, 6, 15:
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4
Write the fact family for 1, 3, 4:
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5
Write the fact family for 12, 3, 15:
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6
Write the fact family for 7, 2, 9:
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