Prime Factorization, Gcf, Lcm

What is the Greatest Common Factor (GCF) of 8 and 12?

• 2

• 4

• 6

• 8

Find the Least Common Multiple (LCM) of 5 and 7.

• 35

• 70

• 12

• 14

Find the GCF of 15, 24, and 12

• 3

• 6

• 4

• 2

Find the Least Common Multiple (LCM) of 4 and 10.

• 2

• 20

• 40

• 10

A prime number has...

• 2 factors

• More than 2 factors

• 1 factor

• Multiple factors

Tags

CCSS.4.OA.B.4

Thomas typed the prime factorization of 8 as 1 x 2 x 2 x 2. What did he do incorrectly?

• He didn't do anything wrong.

• The product is not 16.

• You cannot write the prime factorization with the number 1.

• Thomas is perfect.

The LCM of two numbers will always be bigger than both of the numbers.

• True

• False

If two numbers have a GCF of 1, you multiply them together to find the LCM.

• True

• False

The GCF of 2 numbers will either be one of the numbers or will be smaller than both the numbers.

• True

• False

Which is the prime factorization of 81?

• 9 x 9

• 3 x 3 x 9

• 3 x 3 x 3 x 3

• 3 x 3