Recitation: Finding GCF and LCM

 

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

• 4

• 40

• 15

• 20

What is the GCF of 12 and 18?

• 3

• 4

• 6

• 2

Which is not a factor of 12?

• 3

• 6

• 24

• 8

Bill cut out 6 squares and 8 circles. He divided the cutouts into groups so that the same number of squares and circles were in each group. What is the greatest number of groups he could have made?

• 2

• 3

• 4

• 5

Which of the following is not a multiple of 9?

• 9

• 90

• 19

• 27

Which pair of numbers has a GCF of 10 and LCM of 60?

• 2 and 5

• 20 and 30

• 5 and 10

• 15 and 20

A prime number is:

• A number that is made only by multiplying 1 and itself.

• An odd number.

• A popular number.

• The least common multiple of two numbers.

There are 14 girls and 21 boys in Mrs. Andrew's gym class. To play a certain game, the students must form teams. Each team must have the same number of boys and girls. What is the greatest number of teams Mrs. Andrews can make if every student is on a team?

• 7 teams

• 14 teams

• 21 teams

• 42 teams

Find the Greatest  Common Factor (GCF) of 14 & 22.

• 1

• 2

• 7

• 14

Find the Greatest Common Factor (GCF) OF 32 and 64.

• 12

• 24

• 32

• 4