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What is a quick way to see that the value of the sum 53+18+47+82 is 200?
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What is a quick way to see that the value of the sum 53+18+47+82 is 200?

User Hiro
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you can add up the tens, then roughly estimate what the ones added up will be .
if your estimation is around 200 then you may be correct
User Guiomie
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