Prime & Composite Numbers

Which one of the following numbers is a prime number?

• 45

• 47

• 49

• 51

Which one of the following numbers is a composite number?

• 43

• 53

• 63

• 73

Out of the ten numbers listed below, how many numbers are prime numbers?

1, 2, 3, 4, 5, 6, 7, 8, 9, 10

• Two

• Three

• Four

• Five

Out of the ten numbers listed below, how many numbers are composite numbers?

21, 22, 23, 24, 25, 26, 27, 28, 29, 30

• Eight

• Seven

• Six

• Five

Which one of the following numbers is NOT a Prime Number?

• 31

• 41

• 51

• 61

Which one of the following numbers is NOT a composite number?

• 51

• 52

• 53

• 54

What three-digit prime number can you form using the digits: 1, 2, & 5

Only use each digit once.

• 125

• 152

• 215

• 521

Which one of the following numbers is a prime number?

• 91

• 93

• 95

• 97

Which one of the following numbers is a prime number?

• 21

• 23

• 25

• 27

Which one of the following numbers is a composite number?

• 11

• 13

• 15

• 17