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Prime numbers.

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Presentation on theme: "Prime numbers."— Presentation transcript:

1 Prime numbers

2 Prime Number has only 2 factors.
Numbers that are divisible only by “ 1” and by that number itself are called prime numbers. Prime Number has only 2 factors. Number Divisible by No of factors 6 has more than 2 factors. So it is Not a Prime number 6 1 , 2 ,3 , 6 4 5 only 2 factors. So it is a Prime number 5 1 , 5 2 10 has more than 2 factors. So it is Not a Prime number 10 1, 2, 5, 10 4 13 only 2 factors. So it is a Prime number 13 & 13 2

3 Facts Prime number must be divisible exactly by 2 numbers
“1” – it is divisible only by 1. It is not a prime number ( prime numbers to be divisible by 2 numbers) “2” – is the smallest prime number – divisible by 1 & 2

4 Facts There are 25 prime numbers between 1 and 100.
2 , 3 , 5 , 7 , 11 , 13 , 17 , 19 , 23 , 29 , 31 , 37 , 41, , 47 , 53 , 59 , 61 , 67 , 71 , 73 , 79 , 83 , 89 , 97

5 Try these Find prime numbers between 5 and 15
From the given number below list the prime number 9 , 3 , 23 , 18 , 17 , 15 , 27 3. From the given number below list the prime number 25 , 13 , 27 , 19 , 29 , 17 , 26


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