fact-family
子类别
fact-family/add-sub-within-10-write-all
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fact-family/add-sub-within-10-fill-blanks
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fact-family/add-sub-within-10-find-family
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fact-family/add-sub-within-20-write-all
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fact-family/add-sub-within-20-fill-blanks
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fact-family/mul-div-within-20-write-all
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fact-family/mul-div-within-20-fill-blanks
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fact-family/mul-div-within-50-write-all
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fact-family/mixed-within-20-write-all
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Add Sub Within 10
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fact-family/mixed-within-20-fill-blanks
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Add Sub Within 20
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Add Sub Within 100
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Mul Div 2 5
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Mul Div 6 9
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Mul Div 10 12
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Mixed
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