Primes, Factors and Multiples

Choose one prime number.

• 1

• 2

• 4

• 6

Find the prime number.

• 10
• 9
• 7
• 4

Which list has only prime numbers?

• 2, 3, 4, 5
• 1, 5, 7, 9
• 2, 3, 5, 7
• 2, 4, 6, 8

Name the factors of 16.

• 1, 4, 16
• 4
• 1, 2, 4, 8, 16
• 2, 4, 8

Name the factors of 21.

• 1, 3, 7, 21
• 3, 7
• 1, 21
• 1, 2, 7, 21

Name the factors of 42.

• 1, 6, 7, 42
• 1, 2, 3, 6, 7, 14, 21, 42
• 1, 2, 6, 7, 21, 42

A prime number is...

• a number that has only two factors.

  (1 and itself)

• a number that has at least two factors.

• a number that has more than two factors.

• a number that has only one factor.

Which number is NOT prime?

• 3
• 7
• 17
• 21

What is the prime factorization of 15?

• 3x3x3
• 2x2x5
• 15
• 3x5

Composite numbers:

• Are always bigger than prime numbers
• Have more than 2 factors
• Have 2 pairs of factors
• Don't have factors