Adding/ Subtracting Fractions

LCM

100

What are the first 5 multiples of 4 and 5?

What is the LCM?

4:

5:

4: 4, 8, 12, 16, 20

5: 5, 10, 15, 20, 25

20

200

What are the first 5 multiples of 6?

6: 6, 12, 18, 24, 30

300

What are the first 5 multiples of 3?

3: 3, 6, 9, 12, 15

400

What are the first 10 multiples of 10?

10, 20, 30, 40, 50, 60, 70, 80, 90, 100

500

In your own words, what is the Least Common Multiple?

Answers vary

Like Denominators

100

1/2 + 1/2 =

2/2

200

1/4 + 2/4 =

3/4

300

1/5 + 3/5 =

4/5

400

6/12 + 4/12 =

10/12

500

10/25 + 13/25 =

23/25

Unlike Denominators Easy

100

1/4 + 2/6

14/24

200

1/1 + 1/6 =

7/6

300

2/5 + 1/6 =

17/30

400

3/5 + 1/8 =

29/40

500

1/5 + 1/4 =

9/20

Unlike Denominators Medium

100

3/5 + 1/7 =

26/35

200

2/4 + 3/9 =

30/36

300

5/10 + 1/3 =

25/30

400

1/8 + 3/5 =

29/40

500

8/12 + 1/20 =

172/240