31.7.08

Prime Numbers using Eratosthenes sieve

ERATOSTHENES SIEVE is an excellent way to work on prime numbers. 
You can get the chart "1 to 100" from 'google images'.

 Give each child one chart. Instructions: 
1.strike out all multiples of '2' (our head number) 
2.now strike out all multiples of 3 (other head number) 
3. next 5, 7, and so on... 
When the list is exhausted, the 'head numbers' are the prime numbers! .... they will have a lot of fun doing this! 

Use the activity to introduce Prime Numbers. Connect it to History by asking the students to search for Eratosthenes and write an article...."Who was he? Where was he born? Why did he discover the sieve?"
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