Factors, Prime & Composite

which of the following is not a prime number?

• 41

• 43

• 45

• 47

Which choice lists all the factors for the number 24?

• 2, 3, 4, 6, 8, 12, 24
• 2, 3, 4, 6, 8, 12, 24, 36
• 1, 2, 3, 4, 6, 8, 12, 24
• 1, 2, 4, 5, 6, 8, 12 ,24

Why is 1 a unique number?

• 1 is the only even prime number

• 1 is prime and composite

• 1 is neither prime or composite

• 1 is lonely

What are the factors of 51?

• 1, 5, 10, 51

• None. 51 is a prime number.

• 1, 3, 17, 51

• 1, 5, 11

What is special about the number 2?

• 2 is composite

• 2 is prime an composite

• 2 is the only even prime number

• 2 is odd

Which number below is NOT PRIME?

• 2
• 11
• 13
• 18

Which number is COMPOSITE?

• 11
  11
• 13
• 21
• 23

A PRIME NUMBER is...

• a number that has only one factor.
• a number that has at least two factors.
• a number that has more than two factors.
• a number that has only two factors.
  (1 and itself)

What are the factors of 100?

• 1, 2, 4, 5, 10, 20, 25, 50, 100

• 1, 2, 5, 10, 50, 100

• 1, 10, 100

• 1, 2, 5, 10, 25, 50, 100

Which number listed below is a prime number?

• 1
• 37
• 63
• 33