### Sean's last fraction post

Monday, May 11, 2009

1/4 + 1/5

First you have to find the common denominator

Then you just add the numerators and simplify if you can

1/6 + 3/4

Multiplying

4/5 x 2/5

All you have to do is multiply the numerators and the denominators

If you are multiplying a mixed fraction first you multiply the denominator with the whole number and add the numerator then multiply the numerators and the denominators.

If you have an improper fraction then you find how many groups of the denominator fit into the numerator

Dividing

1/4 1/8

For dividing you have to use a special technique called a repical.

Subtracting

4/5 - 3/5

subtracting is just like adding. First you find the common denominator. Then you just subtract the numerators.

1/6 - 3/4

If you simplify 4/24 it is 1/6

Word Problems

2) It takes 2 1/4 scoops of flour to make one cake. How many cakes do 15 scoops make?

15 scoops will make 6 1/2 cakes.

3) One day in Winnipeg with 10 1/2 hours of daylight, it was sunny for 1/3 of that time. For how many hours was it sunny that day?