SAMPLE Dental Hygiene Entrance Exam Prep

Dental Hygiene Entrance Exam Preparation Study Guide

Chapter 3: Math – Part 1 3.1 Order of Operations

Mathematical operations must be performed in the correct order when you are performing calculations with numbers. First, you must perform the operations in parenthesis. From there you would then simplify the exponents and then complete any multiplication or division from left to right. Finally, addition or subtraction is completed. ● Parenthesis – (anything in here first) ● Exponents – Then %* or - a square root is also a type of exponent ● Multiplication and Division – next × or ÷ ● Addition and Subtraction – finally + or – or ± Use the mnemonic device PEMDAS (Please Excuse My Dear Aunt Sally) to help you to remember the order of operations.

Example Simplify the following expression: 5 + 5 × 5 − 5 ÷ 5 = a. 9 b. 29

Example Simplify the following expression: (2 + 2) × 2 2 = a. 10

b. 4 c. 8 d. 16

c. 5 d. 0

The correct answer is B. To simplify this expression, go through the order of operations.

The correct answer is D. To simplify this expression, go through the order of operations.

5 + 25 − 5 ÷ 5 = 5 + 25 − 1 =

4 × 2 2 =

5 + 24 = 29

4 × 4 = 16

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