# Order

Author:
David
The order in which problems are formed and solved is of extreme importance! EXAMPLE: You go to a store to buy shoes and you choose a \$60 pair of shoes. You have a \$10 off coupon and a 10% off coupon, and you are allowed to use both. Does the order in which you apply the coupons matter? 1. \$60 shoes, apply \$10 off. You now are paying \$50 for the shoes. Next take 10% from \$50. That would be \$5, so you now pay \$45 for your shoes! 2. \$60 shoes, apply 10% off. That's \$6. So you are now paying \$54. Now take off the \$10. That's \$44. This is a fairly trivial example, you've only saved \$1 dollar, but play around with amounts and this can stack up some real cash! So what do we do? Simply guess and figure out which way we want a problem solved on a case by case basis? No, we use ORDER OF OPERATIONS, which you may know as PEMDAS Parenthesis - Simplify anything in parenthesis first Exponents - Apply exponents to whatever remains Multiplication or Division - Multiply and Divide anything that is required next Addition or Subtraction - Add or Subtract anything else last!