fact-family/add-sub-within-20/hard · セット 18
6 problems
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1
Write the fact family for 2, 7, 14:
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2
Write the fact family for 18, 2, 20:
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3
Write the fact family for 4, 5, 9:
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4
Write the fact family for 6, 7, 42:
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5
Write the fact family for 2, 11, 22:
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6
Write the fact family for 3, 3, 9:
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