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P.E.M.D.A.S is a math lesson usually taught between the 4th and 6th grades in the United States. It pertains to the order or precedence of mathematical evaluation - evaluate parentheses first or with most importance, and subtract last or with least importance.

  • P = evaluate Parentheses
  • E = evaluate Exponents
  • M = Mutiply
  • D = Divide
  • A = Add
  • S = Subtract

When the evaluation are only Add & Subtract or Multiply & divide, the parts will be evaluated form left to right.


Examples of Correct P.E.M.D.A.S useage

Example 1: 2*5+4*3

  • by P.E.M.D.A.S , Multiply is first , so we evaluate 2*5 and 4*3 , which equals to 10 and 14
    • Evaluation: 10+12
  • Next is Addtion,Starting from left to right.
    • Final value:24
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