### MYP Mathematics, Prime numbers

Posted:

**Wed Mar 06, 2013 5:34 pm**
by **Lucas**

MYP Maths, Prime and composite numbers

How can we express 80 as the product of its prime factors.

Thanks

### Re: MYP Mathematics, Prime numbers

Posted:

**Wed Mar 06, 2013 5:45 pm**
by **miranda**

MYP Maths, Prime and composite numbers

A prime number is a natural number greater than 1 which has exactly two factors, 1 and itself.

A composite number is a natural number greater than 1 which has more than two factors.

You must know that the number 1 is neither prime nor composite.

Also the Fundamental theorem of arithmetic states that Every composite number can be written as a product of prime factors in one and only one way.

To find the prime factors of a composite number we systematically divide the number by the prime numbers which are its factors, starting with the smallest.

So for your question 80/2=40

40/2=20

20/2=10

10/2=5 which is prime

Thus the prime factorization of 80=2*2*2*2*5