Monday, February 13, 2012

Homework Booklet Chapter 7.4 Question 7.

Homework Booklet Chapter 7.4 question 10.
Lars ran 6 2/3 laps of the track at his school. Reneta ran 8 1/4 laps.
A) How much faster did Reneta run? Show your work.
First I turned 1/4 and 2/3 into a common denominator, which is 12.
1/4 X 3 = 3/12.
2/3 X 4 = 8/12
So after that I subtract 8/12 from 3/12 but you can't do that 'cause you'd get -8/12 or something. So you take a whole number, change 8 to 7 and now it's 15/12 - 8/12 which is 7/12.
Then 7-6 = 1.
1 + 7/12 = 1 7/12
B) Check your answer using estimation.
6 2/3 rounded off to7.
8 1/4 rounded off to 8
8 - 7 =1.

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