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Mathematical Operations



The Order of Mathematical Operations


Please Excuse My Dear Aunt Sally

Mathematical operations are performed in this order:

  • Parentheses
  • Exponents
  • Multiplication/Division (left to right)
  • Addition/Subtraction (left to right).

  • For example, in the expression 2 + 3 x 4, mathematicians have agreed to perform the multiplication before the addition. So the answer is 2 + 12 = 14, not 5 x 4 = 20.


    Contributed by:
    Mark Stanton
    High School Math Teacher
    New York City



    Fractions


    Dividing Fractions


    Kentucky Chicken Fried
    Notice the name is switched a little from that most famous fast-food chicken joint from blue grass country. Use "Kentucky Chicken Fried" to remember KCF.
  • K -- Keep (the first fraction)
  • C -- Change (the sign from divide to multiply)
  • F -- Flip (the last fraction)


  • Contributed by:
    Leanne Sliva
    Herman Middle School, Van Vleck, Texas
    leannesliva@earthlink.net


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