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Mathematics 21 Online
OpenStudy (anonymous):

Sabrina used a calculator and started adding whole numbers in order:1+2+3+4 What is the last number she would add to get to the sum on her calculator over 1000

OpenStudy (mdilley):

well just subtract 10 from 1000 because 1+2+3+4=10, and you are trying to get 1000

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