Adding and Subtracting Fractions

The Common Denominator

100

Find the common denominator.

1/4 + 1/2 

common denominator: 4

200

Find the common denominator.

2/6 + 1/2 =

Common denominator: 6

300

Find the common denominator.

1/3 + 2/4=

Common denominator: 12

400

Find the common denominator.

1/5 + 2/4

Common denominator: 20

500

Find the common denominator.

1/9 x 1/6

Common denominator: 18

Count by...

100

Count by 2s...first 5 numbers

2, 4, 6, 8, 10

200

Count by 3s...first 5 numbers.

3, 6, 9, 12, 15

300

Count by 4s...first 5 numbers.

4, 8, 12, 16, 20

400

Count by 5s...first 5 numbers.

5, 10, 15, 20, 25

500

Count by 6s...first 5 numbers.

6, 12, 18, 24, 30

Add the Fractions

100

2/ 4 + 1/4=

3/4

200

1/3 + 2/6=

4/6

300

2/10 + 2/5=

6/10

400

1/3 + 2/4

10/12

500

1/8 + 1/5=

13/40

Subtract the Fractions

100

6/10 - 2/10=

4/10

200

3/10 - 1/5=

1/10

300

2/3 -1/6

3/6

400

1/3 - 1/4

1/12

500

3/6 - 1/9

7/18

FUN FACTS about Miss Poppema

100

How many sisters does Miss Poppema have?

2

200

What city did Miss Poppema go to college in?

Denver

300

What college team does Miss Poppema cheer for?

Iowa

400

What NFL team does Miss Poppema cheer for?

Broncos

500

What is Miss Poppema's dog's name?

Leo