GCF Practice

Avery gets newsletters by e-mail. He gets one for sports every 5 days, and one for music every 8 days. If he got all three today, how many more days will it be until he gets all two newsletters on the same day again? 

• 80 days
• 40 days
• 50 days
• 60 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

Pencils come in packs of 8 and highlighters in packs of 12.  
A.  What is the least number of pencils and highlighters you need to buy for an equal amount?
B.  What is the least number of packages you need to buy to have an equal amount of pencils and highlighters?

• A. 4  B.  2 pencil and 3 highlighter
• A.  48  B.  6 pencil and 4 highlighter
• A. 24  B. 3 pencil and 2 highlighter

Peter has 18 oranges and 27 pears. 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?

• 9
• 2
• 3
• 4

 Find the GCF of each set of numbers. 
12, 30 

• 4
• 2
• 5
• 6

What is the least common multiple (LCM) of 8 and 5?

• 50
• 40
• 5
• 8

Kseniya is making activity baskets to donate to charity. She has 12 coloring books and 36 crayons. What is the greatest number of baskets she can make if each type of toy is equally distributed among the baskets?

• 2

• 12

• 36

• 6

At the movie theater, they give out a free drink to every 75th customer and a free bag of popcorn to every 30th customer. Who is the first customer that is going to win both free items?

• 16th customer
• 150th customer
• 300th customer
• 180th customer

Salvador goes to karate class every 12 days and to the library every 18 days. On December 1st he went to both class and the library. On what date will he do both class and go to the library?

• 24 days

• 36 days

• 42 days

• 52 days

Is 72 the GCF or LCM of 24 and 36?

• LCM
• GCF