The Numerator and the Denominator of a fraction
is the number that is at the top of the fraction and represents how many 'things' we have. In our examples, the numerator represents how many slices of pizza are left.
is the number that is at the bottom of the fraction and represents how many 'things' make up the whole. In other words, how many slices were in 1 whole pizza--6. Therefore, 6 is the denominator in our example.