Norris- Adding & Subtracting Fractions

Steps

100

What is the 1st step when solving addition and subtraction problems with unlike denominators?

Find a common denominator.

200

What is the 2nd step when adding/subtracting fractions with unlike denominators?

Find equivalent fractions using the new denominator.

300

What is the 3rd step when adding and subtracting fractions with unlike denominators?

Add or subtract the numerators.

400

What is the 4th step when adding and subtracting fractions with unlike denominators?

Simplify 

500

What is the 4th step when adding and subtracting fractions with unlike denominators?

Simplify.

Like Denominators

100

3/7 + 2/7 =

5/7

200

1/3 + 2/3 =

3/3

or 

1

300

5/10 + 4/10 =

9/10

400

6/8 - 2/8 =

4/8

or 

1/2

500

2/3 - 2/3 =

0/0

or

0

Unlike Denominators

100

4/5 - 6/8 =

2/40

200

3/4 - 4/12 =

9/12

300

9/10 - 3/4 =

3/20

400

4/5 - 1/2 =

7/8

500

1/4  +  2/6

7/12