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P. 44
Let’s find all the prime numbers between 1 and 100 using Eratosthenes’
method.
Materials: 2 50 Boards, 1 Number chip set (1-100)
1 Put two 50 boards side by side to make a hundred board and place all the
number chips in order from 1 to 100 on the board.
2 Take the number chip 1 out as it is not a prime number.
3 Take all the chips out that are multiples of 2 except the number chip 2 as
it is a prime number.
4 Repeat the steps to take all the chips out that are the multiples of each
number starting from 3 except the prime nubmers.
5 When the algorithm terminates, mark all the numbers that are left on
the board.
6 Write all the prime numbers between 1 and 100.
4. Prime number · Square number 41
method.
Materials: 2 50 Boards, 1 Number chip set (1-100)
1 Put two 50 boards side by side to make a hundred board and place all the
number chips in order from 1 to 100 on the board.
2 Take the number chip 1 out as it is not a prime number.
3 Take all the chips out that are multiples of 2 except the number chip 2 as
it is a prime number.
4 Repeat the steps to take all the chips out that are the multiples of each
number starting from 3 except the prime nubmers.
5 When the algorithm terminates, mark all the numbers that are left on
the board.
6 Write all the prime numbers between 1 and 100.
4. Prime number · Square number 41
