Sieve of Eratosthenes class 5 Activity

The Sieve of Eratosthenes was conducted in class V ,this method is used to find all the prime numbers that are less than 100.Students were given the following instructions.

Step 1: Write the numbers 1 to 100 in ten rows.

Step 2: Cross out 1 because 1 is not a prime.

Step 3: Circle 2 and cross out all multiples of 2. (2, 4, 6, 8, 10, ...)

Step 4: Circle 3 and cross out all multiples of 3. (3, 6, 9, 12, 15, ...)

Step 5: Circle 5 and cross out all multiples of 5. (5, 10, 15, 20, ...)

Step 6: Circle 7 and cross out all multiples of 7. (7, 14, 21, 28, ...)

Circle all the numbers that are not crossed out and they are the prime numbers less than 100.