
is the full pizza
So to solve it, you need to minus the amount that Lou ate from the whole pizza
So it would be

To reduce to the lowest terms, you would find the greatest common factor for both the numerator(top) and the denominator(bottom) so 2 is a common factor
2÷2=1 and 8÷2=4
So your answer would be

Answer: 
is the fraction of the pizza left over