GCF and LCM

Find the LCM of 12 and 6. 

• 6
• 12
• 2
• 1

What is the GCF of 18 and 24?

• 3
• 6
• 8
• 9

What is the GCF of 7 and 18?

• 7
• 18
• 1
• 3

What are the factors of 25?

• 1, 2, 3, 5, 10, 15, 25
• 1, 5,  25
• 1, 25
• 1, 5

Which is a NOT a factor of 9?

• 0
• 1
• 3
• 9

What is the GCF OF 24 and 48?

• 52
• 58
• 24
• 48

What is the least common multiple (LCM) of 4 and 10?

• 4
• 40
• 15
• 20

Two neon signs are turned on at the same time. Both signs blink as they are turned on. One sign blinks every 9 seconds. The other sign blinks every 15 seconds. In how many seconds will they blink together again?

• 48 seconds
• 45 seconds
• 16 seconds
• 8 seconds

Jenny goes to dance class every 6 days, karate class every 12 days, and to the library every 18 days. On December 1st she went to both classes and the library. On what date will she do both classes and go to the library?

• 24 days
• 36 days
• 42 days
• 52 days

The school cafeteria serves tacos every sixth day and cheeseburgers every eight day. If tacos and cheeseburgers are both on today’s menu, how many days will it be before they are both on the menu again?

• 14 days
• 24 days
• 34 days
• 44 days