Factors and Multiples

Which two numbers are relatively prime?

• 15 and 80

• 16 and 35

• 21 and 51

• 31 and 93

How many factors does 315 have?

• 2

• 4

• 8

• 12

Use the ladder method to find the LCM of 8, 20 and 36.

• 4

• 90

• 72

• 360

What is the greatest prime factor of 333?

• 1

• 3

• 111

• 37

A class has 45 boys and 60 girls. Only boys or girls can sit in a row. What is the greatest number of students that could be in each row if each row must have the same number of students?

• 3

• 5

• 9

• 15

Find the GCF of 150, 210 and 330.

• 3

• 10

• 30

• 45

Witchipoo is making goodie bags for Halloween ghosts and goblins. She has 48 Twix bars, 72 Sour Patch and 96 tootsie pops. What is the greatest number of identical goodie bags she can make?

• 3

• 8

• 24

• 32