In mathematics **Sieve of Eratosthenes** method is one of the best methods for finding * prime numbers from 1to 100*. This method is very simple and everyone can understand easily this method for finding prime numbers.

Actually, the **sieve of Eratosthenes** method will be learning in lower class that is in class 6 we learn this method. Now let’s see how we can find prime numbers by the sieve of **Eratosthenes** method.

**Follow the below given Steps and find the prime numbers from 1 to 100 by using the sieve of Eratosthenes method:**

First, write all the numbers from 1 to 100 as shown in the table.

Cross “1” as it is not a prime number.

Now leave number “2 “as it is a prime number. Because it contains only two factors i.e. 1 and 2.

Then cross all other multiples of 2 starting with 4.

Next number after 2 will be 3.

It is a prime number as it has only 2 factors like 2.

Now cross all other multiples of 3 starting with 6.

Next number is 4 as it’s already crossed so no problem.

After 4 we have 5. 5 is a prime number, so no need to cross it.

All other multiples of 5 should be crossed know.

Next number is 6, it is already crossed.

After 6 we have 7. It is a prime number, so don’t cross it.

Multiples of 7 cross now.

After 7 we have 8 which is crossed already.

That’s it, now the remaining numbers are called prime numbers. Thanks to **Eratosthenes** for introducing this method for knowing **prime numbers from 1 to 100**. Not only up to 100 Eratosthenes method can be applied to any extent. Just try to find out prime numbers from 1 to 200 by this **Eratosthenes** method.

This was very useful and good

the content i can understand

thank you sarthak