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Why should you subtract 10 x 6 and not 9 x 6 or 20 x 6
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Why should you subtract 10 x 6 and not 9 x 6 or 20 x 6

User Michael Seifert
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because it won't equal the same that way
User Mosely
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9x6=54 is much less than 72. 20×6=120 and is close to 72. 10×6 =60 and is close to 72 without going over.
User Gffbss
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