Prime and Composite Numbers

__________ are numbers whose only factors are one and itself.

• Prime numbers

• Composite numbers

• Fractions

• Integers

_______________ have more than two factors.

• Factor tree

• Fractions

• Composite numbers

• Prime numbers

The only even prime number

• 2

• 3

• 5

• 4

Tags

CCSS.4.OA.B.4

True or False.

1 is a prime number.

• True

• False

Tags

CCSS.4.OA.B.4

True or False:

Every composite number can be expressed as a product of prime numbers.

• True

• False

Tags

CCSS.4.OA.B.4

Is 51 a prime number?

• Maybe

• Yes

• No

• Impossible

Is 129 a prime number?

• No

• Yes

• Maybe

• Impossible

Which is equal to 3 x 17?

• 21

• 51

• 61

• 71

Tags

CCSS.3.OA.A.1

CCSS.3.OA.B.5

CCSS.3.OA.C.7

True or False

79 is a prime number.

• True

• False

20 is a composite number. Why?

• Because it has more than two factors.

• Because its only factors are only 1 and itself.