GCF and LCM GRADED Classwork

What is the GCF of 18 and 24?

• 3

• 6

• 8

• 9

What is the GCF of 8 and 10?

• 1

• 3

• 4

• 2

What is the GCF of 8, 36, and 40?

• 4

• 2

• 8

• 1

What is the GCF of 30 and 75?

• 5

• 25

• 15

• 30

Composite numbers:

• are always bigger than prime numbers

• have more than 2 factors

• have exactly 2 factors

• don't have factors

Tags

CCSS.4.OA.B.4

Prime numbers:

• have exactly 2 factors

• have more than 2 factors

• have only 1 factor

• don't have factors

Tags

CCSS.4.OA.B.4

Which is NOT a factor of 9?

• 0

• 1

• 3

• 9

Tags

CCSS.4.OA.B.4

Is 5 prime or composite?

• Prime

• Composite

Tags

CCSS.4.OA.B.4

Is 15 prime or composite?

• Prime

• Composite

Tags

CCSS.4.OA.B.4

List the first 5 multiples of 20.

• 1, 2, 4, 5, 10

• 1, 20, 2, 10, 4, 5

• 20, 40, 60, 80, 100

• 20, 25, 30, 35, 40