# Prime factors

## Slide deck

Download slide deck

## Lesson details

### Key learning points

- In this lesson, we will be investigating the properties and definition of prime factors of numbers, and how to calculate them.

### Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

## Video

Share with pupils

Loading...

### 5 Questions

Q1.

What is the definition of a factor?

A number divides into another number leaving a remainder

A number that multiplies another number to get another number

Q2.

What is a prime number?

A number that can be divided by even numbers only

A number that can be divided by more than two factors

Q3.

Which of these is not a prime number?

11

3

7

Q4.

Which of these is not a factor of 16?

2

4

8

Q5.

Why do square numbers have an odd number of factors?

Because they are even numbers

Because they are odd numbers

### 5 Questions

Q1.

What is the first prime number?

1

3

5

Q2.

What are the prime factors of 18?

2 and 5

3 and 5

3 and 6

Q3.

What is the 7th prime number?

19

23

7

Q4.

12 written as a product of prime factors is 2 x 2 x 3. What is 30 written using prime factors?

2 + 3 + 5

2 x 7

5 x 6

Q5.

Which of the following is not a prime factor of 42?

2

3

7