Prime and Composite Numbers

Prime and Composite

Numbers

Factors:

A factor is a number that you
multiply by another number to
get the product.

2x5=10 In this multiplication
problem 2 and 5 are the
factors.

3x4=12 In this multiplication
problem 3 and 4 are the
factors.

Factors are the numbers you
multiply together to get the
product.

Multiple Choice

What are factors?

• the numbers in a division problem

• numbers that are multiplied together to get a product

• numbers in an addition problem

• numbers in a subtraction problem

Multiple Choice

Which numbers are the factors in this problem?

2x9=18

• 18 and 2

• 18 and 9

• 2 and 9

• 2, 9 and 18

Prime Numbers

The numbers

2, 3, 7, 11, 13, 17, 19, 23,
are prime numbers. They
only have two factors…1
and themselves.

They can only be divided
equally by 1 and
themselves.

Multiple Choice

What is a prime number?

• A number that has only two factors, 1 and itself.

• A number that can be divided equally by 1, itself and 2.

• A number that is odd.

• A number that cannot be divided equally by anything.

Multiple Choice

A prime number....

• Can be divided by many numbers

• Has more than 2 factors

• Can only be divided equally by 1 and itself.

• is every odd number.

Composite Numbers

Composite Numbers can be
divided equally by more numbers
than just 1 and themselves.
Composite numbers have more
than 2 factors.

15 is a composite number
because it can be divided equally
by 1,3,5 and 15.

15 has more than 2 factors, 1, 15,
3, and 5 are all factors of 15.

1x15=15

3x5=15

Multiple Choice

What is a composite number?

• A number that is odd

• A number that has only two factors

• A number that can be divided equally by more numbers than just 1 and itself.

• A number greater than 2.

Multiple Choice

What is a composite number?

• A number that has more than 2 factors.

• A number that only has 2 factors, 1 and itself.

• A number that can only be divided by 1 and itself.

• Every odd number

Multiple Choice

Is the number 20 prime or composite?

• Prime

• Composite

• Neither

Multiple Choice

Is the number 8 prime or composite?

• prime

• composite

• Neither

Multiple Choice

Is the number 19 prime or composite?

• prime

• composite

• neither

Multiple Select

Which of these numbers is prime?

(Select more than one!)

• 2

• 4

• 9

• 11

• 21

Multiple Choice

Which of these numbers is prime?

• 4

• 8

• 9

• 11

Multiple Choice

Zero is best described as

• Prime

• Composite

• Neither

Multiple Choice

Which of these numbers is composite?

• 2

• 11

• 13

• 10

Multiple Choice

1 is best described as

• Prime

• Composite

• Neither

Multiple Choice

Which of these numbers is composite?

• 12

• 5

• 11

• 17

Multiple Choice

Which number is missing in this list of factors for the number 12?

1, 2, 3, 4, 6

• 5

• 9

• 12

• 0

Multiple Choice

Identify the correct list of factors for the number 8

• 1, 2, 4, 8

• 1, 2, 8

• 2, 4, 8

• 1,2, 3, 4, 8

Multiple Choice

Identify the correct list of factors for the number 13.

• 1, 13

• 1, 3, 13

• 1, 2, 3, 13

• 1, 3, 12, 13