Adding and Subtracting Like and Unlike Fractions

Fractions

100

What is the top of a fraction called?

Numerator

200

What is the bottom of a fraction called?

Denominator

300

What is the first step when adding or subtracting fractions?

Look at the denominators

400

If the denominators are different, what's the next step?

Find the LCM

500

After you find the LCM, what's the next step?

Now we find equivalent fractions

Find the LCM

100

What is the LCM of 4 and 2?

4

2, 4

LCM= 4

200

What is the LCM of 2 and 6?

2, 4, 6

6

LCM= 6

300

What is the LCM of 4 and 12?

4, 8, 12

12

LCM= 12

400

What is the LCM of 18 and 6?

18

6, 12, 18

LCM= 18

500

What is the LCM of 4 and 9?

4, 8, 12, 16, 20, 24, 28, 32, 36

9, 18, 27, 36

LCM= 36 

Adding Like/Unlike Fractions

100

5/6 + 3/6=

8/6 Improper

200

5 1/4 + 2 2/4=

7 3/4

300

4 1/5 + 2 2/10=

6 4/10 

400

15 3/6 + 3 3/6=

18 6/6= 19

500

20 1/7 + 13 4/10=

33 38/70

Subtracting Unlike Fractions

100

3/4 - 1/2=

1/4

200

7 4/5 - 2 1/10=

5 7/10

300

10 8/9 - 10 3/9= 

5/9

400

11 2/12 - 5 2/12=

6

500

8 1/8 - 3 3/4=

Stop- Needs Regrouping

LCM= 8