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What does make a ten mean in 17-8?

Updated: 4/28/2022
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9y ago

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Geraldine Davis

Lvl 10
3y ago
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9y ago

This is one of the strategies suggested in the Common Core State Standards for Mathematics. With practice, this strategy can theoretically help younger students gain fluency when subtracting within 20.

I am not a math theorist, so it's mystifying to me how adding an extra step that one is supposed to forget later when the process is memorized could be helpful.

17 - 8 = 17 - 7 - 1 = 10 - 1 = 9

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Q: What does make a ten mean in 17-8?
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