GCF/LCM Khan Questions

Abe is going to plant 54 oak trees and 27 pine trees.

Abe would like to plant the trees in rows that all have the same number of trees and are made up of only one type of tree.

What is the greatest number of trees Abe can have in each row?

• 54

• 27

• 9

• 3

There are 72 boys and 90 girls on the math team.

For the next math competition, Mr. Johnson would like to arrange all of the students in equal rows with only girls or only boys in each row.

What is the greatest number of students that can be in each row?

• 90

• 72

• 18

• 9

Yadira's mom is buying hot dogs and hot dog buns for the family barbecue. Hot dogs come in packs of 12 and hot dog buns come in packs of 9.

The store does not sell parts of a pack and Yadira's mom wants the same number of hot dogs as hot dog buns.

What is the smallest total number of hot dogs that Yadira's mom can purchase?

• 12

• 24

• 36

• 9

Destiny just received two separate gifts from her great-great-grandmother.

The first gift is a box of 18 chocolate candy bars, and the second gift is a pack of 12 cookies.

Destiny wants to use all of the chocolate candy bars and cookies to make identical snack bags for her cousins.

What is the greatest number of snack bags that Destiny can make?

• 6

• 2

• 3

• 4

Your local radio station is having their yearly music player and concert ticket giveaway. For one minute, every 5th

caller will win a music player and every 7th caller will win concert tickets.

You were just the first caller to win both a music player and concert tickets!

What number caller were you?

• 7

• 5

• 25

• 35

Rafaela is a physical education teacher and has 25 girls and 35 boys in her class.

She wants to divide the class into teams of the same size, where each team has the same number of girls and the same number of boys.

If Rafaela creates the greatest number of teams possible, how many boys will be on each team?

• 5

• 7

• 8

• 9

Peter's Party Zone sells cups in packages of 6 and plates in packages of 8. Shaniya is hosting a birthday party for her little sister and wants to have the same number of each item.

What is the least number of packages of plates Shaniya needs to buy?

• 6

• 18

• 24

• 3