GCF/LCM PRACTICE REVIEW

3. What is the greatest common factor of 32 and 80?

A.4

B.8

C. 16

D. 18

• A

• B

• C

• D

4. Which pair of numbers has the least common multiple of 12?

A. 3 and 12

B. 4 and 8

C.2 and 4

D.6 and 8

• A

• B

• C

• D

9. What is the least common multiple of 8 and 4? (a)  

13. Seventy-two tickets are issued for a school concert and 96 cookies are ordered for the reception. Each student gets the same number of tickets as every other student. Each student gets the same number of cookies as every other student.

Fill in each blank to make the following sentence true.
Each student will get ___________ tickets and ___________ cookies.

• 72 AND 96

• 3 AND 4

• 4 AND 3

• 24 AND 24

12. Lighthouse A sounds a foghorn every 4 hours, and Lighthouse B sounds a foghorn every 10 hours.

If both lighthouses sound their foghorns at the same time, how many hours will it be until the next instance when both foghorns sound at the same time?

A. 14 hours

B. 20 hours

C. 24 hours

D. 40 hours

• A

• B

• C

• D

CHOICE 1-

CHOICE 2-

CHOICE 3-

• CHOICE 1- 14

  CHOICE 2- 3

  CHOICE 3- 2

• CHOICE 1- 7

  CHOICE 2- 2

  CHOICE 3- 6

• CHOICE 1- 14

  CHOICE 2- 2

  CHOICE 3- 3

1. What is the least common multiple of 5 and 15?

A. 15

B. 30

C. 45

D. 60

• A

• B

• C

• D

2. If a clock chimes every 6 hours and another clock chimes every 8 hours, how many hours will it take for both clocks to chime together again?

A. 12 hours

B. 24 hours

C. 48 hours

D. 36 hours

• A

• B

• C

• D

3. What is the greatest common factor of 45 and 75?

A. 5

B. 15

C. 25

D. 35

• A

• B

• C

• D

5. What is the least common multiple of 6 and 9?

A. 18

B. 36

C. 54

D. 72

• A

• B

• C

• D