Pre Algebra Parenthesis
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Me First! Me First!
Parenthesis

 
 In the last chapter, we said:
 "Do multiplication and division before addition and subtraction. 
 If you have signs of equal importance, go left to right."
 
 Well, there's one exception.
 Sometimes we have parenthesis in the problem. 
 Like this:
 

 (8 + 4) (4 - 2)

 
 Here's how these work. 
 The stuff inside a set of parenthesis is in its own little world. 
 It gets done first. So:
 

 
 After we've done everything inside the parenthesis, 
 we don't need them any more:
 

 12 2 = 6

 
 Example:
 

 2 + 3 4 2

 

 2 + 12 2

 

 2 + 6

 

 8

 

 Example:

 

 (2 + 3) 4 2

 

5 4 2

 

 5 2

 

 10

 
 Example:
 

(2 + 3 4) 2

 

(2 + 12) 2

 

14 2

 

7

 

   copyright 2005 Bruce Kirkpatrick

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