You often have to write a fraction in its simplest form. This means that you have to cancel it down until it cannot be cancelled down any more. Divide by \(4\). You can do this in two stages.

b}}{{a{b^2}}} = \frac{{a \times a \times b}}{{a \times b \times b}}\) Since a and b are both factors, cancel this fraction by dividing by both a and b from the top and bottom. \(\frac{{{a^2} ...