Numerator and denominator definition

I am studying fractions and how to calculate them and the terms numerator and denominator appear a lot when I read about it, but I do not know the numerator and denominator definition.

i.e.

$$\frac{4}{2} + \frac{8}{2} = \frac{4+8}{2} = \frac{12}{2}$$

Would I like to know your definition?

• Have you tried asking the internet to define numerator? – Ethan Bolker Sep 1 '18 at 14:11
• @EthanBolker I tried, but the explanations are complicated for me and I could not understand. – gato Sep 1 '18 at 14:14

In the fraction $$\frac{p}{q}$$ where $q\ne 0$
$p$ is called Numerator and $q$ is called denominator
• $q$ can be less than zero $q<0$ ? – gato Sep 1 '18 at 14:22