Prime & Composite #'s

A Prime number is

• A number with more than 2 divisors
• A number that is even
• A number whose only divisors are one and itself
• A number that can be divided by 3

Tags

CCSS.4.OA.B.4

A Composite number is

• A number whose divisors are only 1 and itself
• A number that is even
• The number 1
• A number that has more divisors than one and itself

91 is a composite number

• True because it's divisors are 1, itself, 7 and 13

• False, it is a prime number. It's only divisors are 1 and itself.

Janet wrote a list of numbers:
2, 6, 10 & 14
She said all of these numbers are composite because they are even. Is she correct?

• Yes. All even numbers are composite

• No because 2 is the only even number that is prime.

Below are the numbers on the jerseys of 4 hockey players.
Chad  41
Mark  47
Brooke  49
Lee  43
Which members jersey number is a composite number?

• Chad
• Mark
• Brooke
• Lee

Tags

CCSS.4.OA.B.4

Derik bought a lottery ticket with the numbers

87, 42, 35, 1, 49 and 5

How many of his numbers are Prime?

• 1

• 2

• 3

• 4

Is the number 51 prime or composite?

• Prime. It's only divisors are 1 and itself,

• Composite, it's only divisors are 1 and itself.

• Composite, it's divisors are 1, itself, 3 and 17

Jordan says that 21 is a prime number because it is odd. Is he correct?

• Yes, all odd numbers are prime and all even numbers are composite

• No, it is composite because it can be divided by 1, itself, 3 and 7

Is the number 53 prime or composite?

• Prime, it's only divisors are 1 and itself.

• Composite, it's divisors are 1, itself and 3.