+0  
 
0
296
1
avatar+164 

21 - 3 (4-1) 

 

My scientific calculator says the answer is 12, but how?  I tried the BODMAS rules but came to a different answer.

 Oct 25, 2017
 #1
avatar+556 
0

Brackets:

4-1 = 3

now we have 21 - 3(3)

Over: Nothing

Division and Multiplication: No division, but we are multiplying 3 by 3 (parenthesis neighbors):

3 * 3 = 9

now we have 21 - 9

Addition and Subtraction: No addition, but we are subtracting 9 from 21

21 - 9 = 12

The answer is 12.

 Oct 25, 2017

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