CBSE Book Class 6 Maths Activity 2

To find prime numbers between 1 to 100 by Eratosthenes Sieve's method.

Learning Objective : To list prime numbers between 1 to 100.

Pre-requisite : Knowledge of factors and multiples.

Materials Required : A grid paper / squared paper, sketch pens.

Procedure : 

Step 1. Take a grid paper/squared paper and cutout a 10 x 10 square from it.

Step 2. Write numbers from 1 to 100 in this grid as shown in Fig. 2(a).

Step 3. Colour the box with number 1 with any colour say blue as shown in Fig 2(a).

Step 4. Now en circle the number 2 with green colour, as it is a prime number.

Step 5. Next, cross all the multiples of 2 with red colour as shown in Fig. 2(b).

Step 6. Next, encircle the number 3 (prime number) with green colour and cross all multiples of 3 by red colour as shown in Fig. 2(c)

Step 7. Encircle the next prime number 5 with green colour and cross all it's multiples by red colour.

Step 8. Encircle the next prime number 7 with green colour and cross all it's multiples by red colour.

Step 9. Continue with this process till all the numbers are either encircled (prime numbers) or crossed to obtain Eratosthenes sieve.

Please refer to the link below - CBSE Class 6 Maths Activity 2