Operations with fractions

Adding

100

What do we do with the denominators in order to add fractions.

Find a common denominator

200

1/2 + 3/4

5/4 or 1 1/4

300

1 2/5 + 2/3

31/15 or 2 1/15

400

5/12 + 3/8

19/24

500

7/15 + 5/6

1 3/10

Subtracting

100

1/2 - 1/3

1/6

200

2/3 - 1/6

1/2

300

3/4 - 1/2

1/4

400

11/12 - 2/3

1/5

500

5/9 - 1/2

1/18

Multiplying

100

4/5 * 4/7

16/35

200

2/3 * 3/4

1/2

300

3/7 * 3/4

9/28

400

3/10 * 4/5

6/25

500

2  3/4 *  2  1/3

77/24 or  3  5/24 

Dividing

100

3 ÷ 1/2

6

200

3/4 ÷ 5

3/20

300

2/3 ÷ 4/5

5/6

400

11/3 ÷ 1/2

7 1/3

500

2 3/4 ÷ 1/2

5 1/2

Math Vocabulary

100

What is the bottom number called in a fraction?

denominator

200

What is the top number in a fraction called?

numerator

300

What do we call a number that has a whole number and a fraction?

Mixed number

400

What do you call the answer to an addition problem?

sum

500

What do you call the answer to a subtraction problem?

difference