Exploring Prime and Composite Numbers

Which of the following pairs are factors of 36?

• 1 and 35

• 2 and 18

• 3 and 11

• 4 and 8

Tags

CCSS.4.OA.B.4

What is a prime number?

• A number with exactly two factors: 1 and itself

• A number with more than two factors

• A number that is odd

• A number that is even

Tags

CCSS.4.OA.B.4

Which of the following is a prime number?

• 7

• 9

• 4

• 6

Tags

CCSS.4.OA.B.4

Which number is the only even prime number?

• 6

• 2

• 8

• 4

Tags

CCSS.4.OA.B.4

What defines a composite number?

• A number that is prime

• A number with more than two factors

• A number that is neither prime nor composite

• A number with exactly two factors

Tags

CCSS.4.OA.B.4

Which of the following is a composite number?

• 2

• 3

• 7

• 9

Tags

CCSS.4.OA.B.4

What is the prime factorization of 28?

• 2 x 2 x 2 x 3

• 4 x 7

• 2 x 2 x 7

• 2 x 14

What method is used to find the prime factorization of a number?

• Factor tree

• Addition

• Division

• Subtraction

What is the prime factorization of 36 using the factor tree method?

• 4 x 9

• 2 x 18

• 2^2 x 3^2

• 3 x 12

If you start with 6 x 6 to find the prime factorization of 36, what do you get?

• 2 x 3

• 2^2 x 3^2

• 4 x 9

• 6 x 6