I suppose one way you could do division is to use the basic long-division algorithm that we all learned at school. Another way to do division might be the Newton-Raphson method for division.

The method works in this way:

Instead of dividing, we can multiply by reciprocals, which is faster. But in order to do this, we must find a reciprocal. Using Newton's Method, we can get an arbitrarily close value for the reciprocal using only multiplication and subtraction.