1.2 Learn Basic Properties and Operations
Order of Operations
When an expression has more than one operation, the order that you perform the operations could affect the answer.
Consider this expression: | $$8 + 4 \times 5$$ |
If you add first, the answer is 60. | |
If you multiply first, the answer is 28. |
Mathematicians have agreed upon a set of rules for solving problems with more than one operation. The rules are called the order of operations.
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To remember these steps, many people memorize this acronym, or memory trick: Please Excuse My Dear Aunt Sally (PEMDAS). The letters stand for parentheses, exponents, multiplication, division, addition, and subtraction.