Cynthia Understanding Prime and Composite Numbers

What is a prime number?

• A prime number is any even number.

• A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.

• A prime number is a natural number less than 1.

• A prime number is a number that can be divided by 2.

Identify if 7 is a prime number.

• No, 7 is not a prime number.

• 7 is an even number.

• Yes, 7 is a prime number.

• 7 is a composite number.

Is 12 a prime number or a composite number?

• prime

• even

• odd

• composite

List all the prime numbers between 1 and 20.

• [2, 3, 5, 7, 11, 13, 17, 19]

• 2, 4, 6, 8, 10, 12, 14, 16, 18

• 3, 5, 7, 9, 11, 13, 15, 17, 19

• 1, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20

What is the smallest prime number?

• 2

• 3

• 1

• 5

Identify if 15 is a prime number.

• It is only divisible by 1

• 15 is a composite number

• Yes

• No

What is a composite number?

• A composite number is a prime number greater than 1.

• A composite number is any negative integer.

• A composite number is a positive integer that is only divisible by 1.

• A composite number is a positive integer greater than 1 that is not prime.

Is 1 a prime number? Why or why not?

• Yes, 1 is a prime number because it is only divisible by itself.

• No, 1 is not a prime number.

• 1 is a prime number since it has two distinct positive divisors.

• 1 is considered a prime number in some mathematical contexts.

List the factors of 18.

• 2, 3, 5, 6, 9, 11

• [1, 2, 3, 6, 9, 18]

• 4, 5, 7, 8, 10, 12

• 1, 2, 3, 6, 9, 15

What is the difference between prime and composite numbers?

• Prime numbers can be divided by any number; composite numbers cannot.

• Prime numbers have more than two divisors; composite numbers have exactly two.

• Prime numbers have exactly two distinct positive divisors; composite numbers have more than two.

• Prime numbers are always even; composite numbers are always odd.