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MYP Mathematics, Prime numbers

PostPosted: 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

PostPosted: 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

Re: MYP Mathematics, Prime numbers

PostPosted: Wed Mar 06, 2013 6:01 pm
by Lucas
Thank you miranda!!