# Finding all prime numbers between 1 to 100

To check remember:

`1` to `100=25` Prime numbers

There are only 25 prime numbers between 1 and 100.

## Rules

1. Write all the numbers from 1 to 100 in six columns.

2. Scratch out the 1 – it's not a prime number.

3. Circle the ones you do know

My |
dog |
bites |
several |
K |
G |
B |
men |

2 |
3 |
5 |
7 |
1 |
1 |
1 |
3 |

2 |
3 |
5 |
7 |
11 |
13 |

4. Now draw a straight line down all the even numbers except 2.

5. Draw a straight line down all the multiples of three except 3.

6. Draw diagonal lines for all the multiples of 5 and 7 except 5 and 7.

This leaves the 25 prime numbers between 1 and 100 which are: