Addition
2/9 + 2/9 =
4/9
8/10 - 4/10 =
2/5
1/2 x 3/5 =
3/10
2/5 ÷ 3/4 =
8/15
What is the first thing you need to check when adding or subtracting fractions?
Hint: You cannot add/subtract fractions unless you have this first.
Check for a common denominator.
3/4 + 1/10 =
17/20
1/3 - 1/4 =
1/12
3/5 x 1/3 =
1/5
1/3 ÷ 7 =
1/21
What is an improper fraction?
A fraction where the numerator is greater than the denominator
4/5 + 4/10 =
1 1/5
2 - 1/2 =
1 1/2
5 x 3/10 =
1 1/2
9 ÷ 3/4 =
12
Do you need to get a common denominator when multiplying fractions?
No!
You only need a common denominator for adding and subtracting fractions.
5 1/3 + 1 1/3
6 2/3
7 4/5 - 2 1/5 =
5 3/5
3 x 2 1/2 =
7 1/2
4 1/2 ÷ 3 3/5
1 1/4
What do you have to do whenever you are asked to divide fractions?
Multiply by the reciprocal (Keep, Change, Flip)
1/5 + 2/3 + 1/2 =
1 11/30
5 1/4 - 4 2/5 =
17/20
2 2/5 x 2 1/2 =
6
6/7 ÷ 8/9 =
27/28
When multiplying and dividing fractions, what should you do first when you see a mixed number?
Change the mixed number to an improper fraction