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4. Math > 38. Calculate Mental Checksums

Calculate Mental Checksums

Computers use checksums to ensure that data was not corrupted in transmission. Now your brain can use a checksum for your mental math, with a few easy techniques.

It’s important to have some way to check your mental math that doesn’t take as long as solving the problem did originally, and ideally is much shorter. It’s easy to check your math for the four basic operations of arithmetic (addition, subtraction, multiplication, and division) by calculating digit sums for the numbers involved. A digit sum is a special kind of checksum or data integrity check. Checksums are used all over the world of computing, from credit cards to ISBNs on books, to downloads you make with your web browser. Now your brain can use them, too.


  

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