Uncommon Denominator Practice

LCM (Least Common Multiple)

100

What does LCM stand for?

Least Common Multiple 

200

Do we use the numerator (top number) or the denominator (bottom number) to find the LCM 

Denominator (bottom number) 

300

What is the LCM for 3 and 4

12

400

Find the LCM for 3/8 and 1/2

8

500

Find the LCM for 1/6 and 4/9

18

Common Denominators

100

1/10 +1/10

2/10 or 1/5

200

9/13-6/13

3/13

300

25/30-20/30

5/30 or 1/6

400

18/20+2/20

20/20 or 1 

500

5/15+3/15+2/15

10/15 or 2/3

Adding Uncommon Denominators

100

1/2+3/4

5/4 

200

2/5+1/4

13/20

300

2/3+1/5

13/15

400

4/9+3/6

17/18

500

4/50+3/5

34/50

Subtracting Uncommon Denominators

100

17/18-5/9

7/18

200

3/4-2/8

4/8

300

7/8-2/3

5/24

400

2/3-7/12

1/12

500

9/10-13/15

1/30

Division Review

100

48/6

8

200

39/3

13

300

7.2/18

0.4

400

715/13

55

500

4.14/0.45

9.2