GCF & LCM

What is the greatest common factor (GCF) of 18 and 24?

• 3

• 6

• 8

• 9

Caleb has 18 oranges and 12 bananas. He wants to make fruit baskets with the same number of each fruit in each basket. What is the greatest number of fruit baskets he can make?

• 3

• 4

• 5

• 6

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

• 4

• 15

• 40

• 20

What is the least common multiple (LCM) of 6 and 8?

• 6

• 8

• 24

• 48

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?

• 30

• 45

• 50

• 90

List all the factors of 12.

• 1, 2, 3, 4, 6, 12

• 1, 2, 6, 12

• 1, 12

• 1, 3, 4, 12

Sadie has 16 pink flowers and 24 purple flowers. She wants to make bouquets with the same number of each color flower in each bouquet. What is the greatest number of bouquets that she can make?

• 8

• 4

• 2

• 48

What is the greatest common factor (GCF) of 5 and 7?

• 1

• 5

• 7

• 35

What is the greatest common factor (GCF) of 12 and 8?

• 2

• 6

• 4

• 8

Kane has two pieces of wood: one is 90 inches and the other is 72 inches. He wants to cut both pieces into smaller pieces of the same length. What is the longest possible length he can cut and not have any lumber left over. (Find the GCF.)

• 9

• 2

• 18

• 72