2When do we use Order of Operations? If you’ve only got one or two operations in an equation, it’s pretty simple to see what to do first, then second.Once you get into more complicated equations, however, you need the Order of Operations.To help remember the order, remember the following sentence:Please excuse my dear aunt sally.
3Evaluate 7 + 4 • 3 Is your answer 33 or 19? You can get 2 different answers depending on which operation you did first. We want everyone to get the same answer so we must follow the order of operations.
4Please Excuse My Dear Aunt Sally The first letter of each word reminds us of the order:Please – P stands for Parentheses (grouping symbols)Excuse – E stands for ExponentsMy – M stands for MultiplicationDear – D stands for DivisionAunt – A stands for AdditionSally – S stands for Subtraction
5PEMDAS Parentheses Exponents Multiplication, Division, Addition, and Subtraction are done from left to right.
6Evaluate the expression when x=4. Start with the expressionSubstitute in 4 everywhere you see an xUse PEMDAS! Parentheses firstFinish parentheses,next is exponents!Multiply next.Finish up!
7Experiment Use the expressions Arrange grouping symbols (parentheses) to make this expression equal:1465438Don’t change the order of the values!
8Example #1Using the left – to – right rule:24-8-630+5-2
12Calculator Test Enter this into your calculator If you got 6.1 then your calculator automatically does the order of operations for you.If you got 0.6 then your calculator does not use order of operations and you’ll need to use the parentheses when you enter equations into your calculator.
13Solve the problem: · 5-3,236410716,996Answer Now