LCM Quiz Review

LCM

100

What is the LCM of 3 and 15?

15

200

What is the LCM of 5 and 7?

35

300

What is the LCM of 8 and 10?

40

400

What is the LCM of 9 and 12?

36

500

What is the LCM of 4, 8, and 12?

24

LCD

100

Convert the fractions using the LCD: 3/4 and 1/2

3/4 and 2/4

200

Convert the fractions using the LCD: 1/4 and 3/5

5/20 and 12/20

300

Convert the fractions using the LCD: 6/8 and 4/7 

42/56 and 32/56

400

Convert the fractions using the LCD: 3/12 and 2/9

9/36 and 8/36

500

Why do you need to find the LCD of two fractions?

When you and convert fractions with the LCD, they have the same denominator so then you can add and subtract them or compare/order them.

Compare Fractions

100

1/2        9/18

=

200

4/5          11/12

<

300

5/8         7/12

>

400

3/7       5/13

>

500

12/20        87/100

<

Order Fractions

100

1/2, 5/6, 1/3

1/3, 1/2, 5/6

200

3/4, 2/3, 5/12

5/12, 2/3, 3/4

300

3/5, 4/12, 4/10

4/12, 4/10, 3/5

400

4/6, 5/8, 6/12

6/12, 5/8, 4/6

Story Problems

100

Suzie Q. has two water bottles. The purple one is 4/5 of the way full, and the green is 7/10 of the way full. Which one has more water in it?

The purple one

200

Suzie Q. is practicing her sprints. On Monday, she runs 8/10 of a mile. On Wednesday, she runs 12/15. Which day did she sprint farther?

Suzie Q. sprinted the same amount on Monday and Wednesday.

300

Suzie Q. is working on her homework. She gets 4/6 of her math homework done and 5/9 of her science homework done. Which homework did Suzie Q. complete less of?

Science homework

400

Suzie Q. is finding the LCD of 5/6 and 7/8. Suzie says the LCD is 48. Is Suzie Q. right or wrong? Why?

Suzie Q. is wrong. The LCD is 6 and 8 is 24.