Understanding G.C.F and L.C.M

What is the G.C.F of 12 and 16?

• 4

• 6

• 8

• 2

Find the L.C.M of 3 and 5.

• 20

• 10

• 15

• 12

What are the prime factors of 18?

• 1, 18

• 4, 5

• 6, 9

• 2, 3

If the G.C.F of two numbers is 4 and one number is 12, what is the other number?

• 16

• 4

• 8

• 12

Calculate the L.C.M of 6 and 8.

• 30

• 18

• 12

• 24

List the prime factors of 30.

• 1, 2, 3, 5

• 2, 3, 6

• [2, 3, 5]

• 3, 5, 10

Tags

CCSS.4.OA.B.4

If two numbers have a G.C.F of 1, what does that mean?

• The two numbers are coprime.

• The two numbers have a common factor greater than 1.

• The two numbers are both even.

• The two numbers are multiples of each other.

What is the L.C.M of 4, 5, and 10?

• 20

• 12

• 15

• 30

Find the G.C.F of 20 and 25.

• 15

• 5

• 20

• 10

If the L.C.M of two numbers is 60 and one number is 15, what is the other number?

• 12

• 20

• 10

• 4