Adding and Subtracting Fractions w/ Unlike Denominators

Changing both sides

100

1/2 + 1/3

5/6

200

1/4 + 1/3

7/12

300

2/3 +3/5

19/15 

or

1 and 4/15

400

2/3 - 2/4

2/12

500

4/6 + 3/4

18/12

or

1 and 6/12

or 1 and 1/2

Adding Fractions w/ unlike denominators

100

1/5 + 3/10

5/10 or 1/2

200

1/9 + 2/3=

7/9

300

1/4 + 7/12

10/12 or 5/6

400

6/12 + 2/6=

14/12 OR 

1 and 2/12 OR

1 and 1/6

500

 2/7 + 7/28=

15/28

Subtracting fractions w/ unlike denominators

100

1/2 - 1/4=

1/4

200

2/3 - 1/6=

3/6 OR 1/2

300

2/5 - 3/15=

3/15

400

3/4 - 12/20

3/20

500

2/3 - 3/15

7/15

Adding and subtracting mixed numbers w/ unlike denominators

100

 3/4 + 2/3=

17/12  OR 1 and 5/12

200

3/4 + 5/12=

14/12 OR 1 and 2/12

300

1 2/4 + 4/16=

1 12/16

or

1 3/4

400

2 and 1/3 - 1 and 1/6=

1 and 1/6

500

3 and 4/5 + 1 and 9/10

5 and 7/10

Vocabulary

100

What is a denominator?

The number below the line in a fraction.

200

What is a numerator?

The number above the line in a fraction.

300

What does equivalent mean?

Equal in value or the same in value.

400

What is the magic phrase Meheh always says for making equivalent fractions?

What you do to the bottom, you do to the top!

or

What you do to the top, you do to the bottom!

500

What is a common denominator?

When the bottom number of the fraction is the same for both fractions.