So, we can just circle each of them as we go forward on the number grid. Now, what happens when you go the next numbers? All the numbers now do not have any other multiple. Like before, we circle it and cross all the multiples of 11. Like before, we circle it and cross all the multiples of 7 We identify all multiples of 5 and cross them. We now move on to the next number, which is 5 and circle it.Circle it out and start identifying the multiples of 3 and cross them. Now we go to the next available number, which is 3.Start by identifying all multiples of 2 and cross them out.

$100 prime numbers list$

Now go to the next number, which is 2 and circle it.

The numbers are arranged in a 10 x 10 square

First, we list all the numbers from 1 to 100.

Let us use the method given by Greek Mathematician, Eratosthenes, to identify prime numbers between 1 and 100.

However, it was not until the 17th century that mathematicians like Fermat, Euler, and Gauss began to examine the structure within prime numbers. It’s an algorithm that calculates prime numbers. It was another Greek mathematician Eratosthenes who invented the “Sieve of Eratosthenes” which helps in filtering out prime numbers from natural and composite numbers. He mentioned ‘Protos’ which translates into a word that means prime numbers. Greek mathematician Euclid first mentioned prime numbers in his work ‘Elements’. Simply put, they are the first numbers from which other numbers emerge through multiplication. All prime numbers are odd numbers, apart from the number two. These numbers are called Prime Numbers What is a prime number?īy definition, prime numbers are those numbers that have only two factors, one and itself.Ī prime number is a whole number that is greater than one. Looking at the above examples, we find there are some numbers which are not divisible by any other number other than one and itself without leaving a remainder. How many do we get? Arranging 6 marbles in equal groups Now we have 6 marbles and we have to arrange them in equal groups. In how many ways can you arrange them in equal groups? Arranging 7 marbles in equal groups There are only 2 ways Arranging 5 marbles in equal groups Assuming you have 5 marbles, in how many ways can you arrange them in equal groups? Let us start with examples to understand the concept of prime numbers. Numbers are very intriguing and there are so many ways to decipher them. Online Math Classes > Math Concepts > Number Systems > Prime Numbers