Hello Tweety Originally Posted by

**Tweety** Thank you, Also is that a general rule that when you have one fraction on top of another fraction and thier denominators are the same you can cancel them?

Yes. When you have something like$\displaystyle \frac{\left(\dfrac{A}{B}\right)}{\left(\dfrac{C}{B }\right)}$

you can multiply top-and-bottom of the main fraction by $\displaystyle B$:$\displaystyle \frac{\left(\dfrac{A}{B}\right)\times B}{\left(\dfrac{C}{B}\right)\times B}$

which then cancels each of the $\displaystyle 'B'$ denominators to leave you with$\displaystyle \frac{A}{C}$

Grandad