Prime Factorization and GCF/LCM Problems

Find the GCF of 64 and 144?

Find the LCM of 18 and 24.

Find th LCM of 42 and 66.

• 2772

• 6

• 462

• 132

You lift weights every 3rd day and take karate class every Monday.

Today you have karate and are lifting weights. In how many days will you lift weights and have karate on the same day?

• 7

• 10

• 14

• 21

Ginny has two vegetable gardens. In the first garden, Ginny grows tomatoes every 2 years. In the second garden, Ginny grows tomatoes every 3 years. This year, Ginny grows tomatoes in both gardens. In how many years will she grow tomatoes in both gardens again?

• 6

• 1

• 4

• 5

• 6

• 12

• 22

• 8

Use a number tree to find the prime factorization of 42.

• 4x4x3

• 6x7

• 7x3x2

• 5x4x2

Which is the correct prime factorization tree for the number 36?

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• 
• 
• 

Ms. Waters was trying to find the GCF using the ladder method, but she made an error along the way! Identify the step where she went wrong.

• Step 1

• Step 2

• Step 3

• Step 4

Sara had 16 red flowers and 24 yellow 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?

• 4

• 2

• 48

• 8