What times what that equals 43?

Answer 1

If you are not concerned with the numbers being round, then there are an infinite number of answers to this. If, on the other hand, you want to stick to round numbers, then there are very few answers:

1 * 43

-1 * -43

43i * -i

-43i * i

If you only want real integers, then you're down to two answers:

1 * 43

-1 * -43

And if you only want natural numbers, then there's only one answer:

1 * 43

This is because 43 is a Prime number, and has no factors.