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LET US FIND PRIME NUMBERS : 

LET US FIND PRIME NUMBERS ERATHROTHANES SEIVE MATHEMATICS CLASS 6

Slide 2: 

Let us find all the prime numbers less than 100..

Slide 3: 

Define Natural Numbers. Define prime numbers. Define composite numbers. What are square numbers and how may factors do they have. Give Reasons: : One is not a prime number : Two is a prime number.

Slide 4: 

All the multiples of 2 are here. Is there a prime number hidden in the colored strips ?

Slide 5: 

All the multiples of 5 are here. Is there a prime number hidden in the colored strips ?

Slide 6: 

All the multiples of 3 are here. Is there a prime number hidden in the colored strips ?

Slide 7: 

All the multiples of 7 are here. Is there a prime number hidden in the colored strips ?

Slide 8: 

All the multiples of 11 are here. Is there a prime number hidden in the colored strips ?

Slide 9: 

Let us color all the composite numbers we have seen.

Slide 10: 

Let us test; Are all the remaining numbers prime numbers?

Slide 11: 

List the prime numbers less than 30 ? How many prime numbers are less than 100 ? Is there any even prime number ? Is “ONE” a prime number ? List 6 consecutive composite numbers. How many sets of 5 consecutive prime numbers are there ?