## Pre-Algebra Tutorial

#### Intro

The order of operations can be tricky. A key to ensuring computation is accurate, is to review the order of operations. This problem has a twist that also involves calculating negative numbers.

#### Sample Problem

Solve: 7-[8-4(3-5)]

7

-9

15

9

31

#### Solution

Order of Operations*from left to right*

P-parenthesis
E-exponents
M-multiplication
D-division
S-subtraction

7-[8-4(3-5)] Evaluate the innermost grouping symbol first.

= 7-[8-4(-2)] Perform multiplication before subtraction.

= 7-[8-(-8)] When subtracting negative numbers with unlike symbols, follow the rules.

=7-16 Apply the rule for subtraction.

=7+(-16)= -9

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