Question

What's an easy way to find factors of large numbers?

Answer 1

what do you mean?

Answer 2

Well, for example i need the factors of 51, what is an easy way to find that?

Answer 3

well... you'd want to see if any really small number can divide

so... let's see
any number divisible by 2 has to end in an even number so 51 ends with 1, that's odd

any number divisible by 3 you can add the digits and see if that yields a known factor
51 or 5 + 1 = 6 so 6 is really divisible by 3
so 51 is also divisible by 3
thus
start off with 3 and see how far that can go

Answer 4

hint: 17 is a prime number

Answer 5

and a factor of 51

Answer 6

okay well now i see bc 17 x 3 = 51

Answer 7

cool