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Math Study Strategies
Math for Automotives
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Remember to use the Order of Operations when you do calculations.
Think PEMDAS-or “Please excuse my dear Aunt Sally” - to use the
Order of Operations:
P stands for Parenthesis. Do operations in parenthesis first.
E stands for Exponents. Do all of these after any parenthesis.
M stands for Multiplication.
D stands for Division.
A stands for Addition.
S stands for Subtraction.
When solving problems involving the order of operations, remember
the following:
For more information about this and other math topics, come to the Math Lab 722-6300 x 6232. Caproiu & Hall, 2000
1. The parenthesis ( ) tell which operation to do the first. After working
inside the parenthesis, you must do multiplication and division before
addition and subtraction.
2. The braces { } show the next numbers to work with. Inside the braces,
multiply and divide before you add and subtract.
3. The brackets [ ] show the third group of numbers to work with. Again,
multiply and divide, then add and subtract.
After working in the parethesis, braces, and brackets, do the remaining
multiplication and division before addition and subtraction, from left to right.
There are two exceptions:
If the expression starts with division and then multiplication, and there is no
addition or subtraction sign between the multiplication and division, perform
division first and multiplication second.
27 ÷ 3 × 2 = 9 × 2 = 18
If the expression starts with subtraction and then addition, and there is no
multiplication or division sign between the addition and subtraction, perform
subtraction first and addition second.
8−5+2 = 3+2 = 5
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