fact-family/add-sub-within-20/hard · セット 100
6 problems
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1
Write the fact family for 17, 2, 19:
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2
Write the fact family for 19, 1, 20:
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3
Write the fact family for 10, 6, 60:
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4
Write the fact family for 6, 4, 10:
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5
Write the fact family for 3, 3, 9:
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6
Write the fact family for 18, 1, 19:
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