Question

Find the product 4x2 (mod 5)

Answer 1

Do you know much about modular arithmetic?

Answer 2

Because this question just pretty much relies on its definition (and none of the amazing theorems etc. based on it :( ).

\[ \text{If }a \equiv b (\mod n) \text{ then } a = b + kn\] where k is some constant. But that is a little to complex; just divide (4*2) by 5 and the remainder is your answer.