Thread: 6÷2(1+2) = ? View Single Post
May 8th, 2011, 07:04 AM   #187 (permalink)
XplosiV
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Quote:
 Originally Posted by susanlai89 ‎6÷2(2+1)=?...some said 1 some said 9... I said 6÷2(2+1)=6÷4+2=3/2 + 2= 7/2 and for ‎6÷2(1+2)=?...some said 1 some said 9... the solution should be 6÷2(1+2)=6÷2+4=3+4=7
In any form of math this answer is clearly wrong since the 6 is outside the brackets, it has to operate on everything within the brackets.

The simple answer is that order of operation dictates that;

terms inside parenthesis
exponents and roots
multiplication and division

This means that, step one

Step 2 there are two ways to go here,

V1.0 if you subscribe to the rule that multiplication and division have no precedence then you operate from left to right.

6/2 = 3

3*3 = 9

V2.0 If you subscribe to the rule that PEMDAS = Parenthesis -> exponents > multiply -> divide -> add -> subtract

2*3 = 6
6/6 = 1

 Last edited by XplosiV; May 8th, 2011 at 07:07 AM.