Adding & Subtracting Fractions with Unlike Denominators

Adding Fractions with Unlike Denominators

100

1/4 + 2/3 = 

11/12

200

4/9 + 1/6 =

*write your answer in simplest form 

11/18

300

3/4 + 1/9 =

31/36

400

1/2 + 1/3 =

5/6

500

1/4 + 3/7 =

19/28

Subtracting Fractions with Unlike Denominators

100

4/5 - 1/3 =

7/15

200

4/3 - 2/7 =

22/21 

300

3/4 - 1/9 =

23/36

400

6/7 - 1/2 =

5/14

500

9/10 - 1/4 =

13/20

Simplify

100

2/8

1/4

200

20/30

2/3

300

18/36

1/2

400

12/36

1/3

500

21/28

3/4

Understanding Fractions

100

What is the TOP number of a fraction called?

The Numerator 

200

What is the BOTTOM number of the denominator called?

The Denominator

300

A fraction with a numerator that is LARGER than the denominator

An improper fraction

400

If the denominators are the same for two fractions, do we have to find the least common denominator (LCD)?

No, we can add or subtract the fractions as is.

500

What is the first thing you do when you are adding or subtracting fractions with unlike denominators?

Find the multiples of the two denominators.

Factors Review

100

List the factors of 18

1, 2, 3, 6, 9, 18

200

List the factors of 30 

1, 2, 3, 5, 6, 10, 15, 30

300

List the factors of 21 

1, 3, 7, 21

400

List the factors of 9 

1, 3, 9

500

List the factors of 8

1, 2, 4, 8