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Explain how you would estimate to subtract 189 from 643

User Guy Kahlon
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well frist you cant do 189 from 643. u have to do 643 - 189.and that well be 743
User Mike Beckerle
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643 will round to 600 and 189 will round to 299 so 600 - 200 = 400
User Earthbounce
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