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4. Using inverses

  • Addition and subtraction are inverses (opposites). So subtraction can always be checked by adding:
    To check 82 - 37 = 45, you could add 45 and 37 and see if you get 82.
  • Multiplication and division are also inverses. So division can always be checked by multiplication:
    To check 81 รท 3 = 27, you could multiply 27 by 3 and see if you get 81.





 
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