grade-1/subtraction
하위 범주
grade-1/subtraction/facts-to-10
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grade-1/subtraction/facts-to-20
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grade-1/subtraction/picture-sub-20
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grade-1/subtraction/within-20
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grade-1/subtraction/without-regrouping
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grade-1/subtraction/number-line-sub
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grade-1/subtraction/fact-families
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grade-1/subtraction/missing-subtrahend
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