The big rectangle above is one pizza.  Since Fred has 6 people eating the one pizza, he has cut it into 6 equal pieces.
 
 
 
 
 
 

The gray portion represents the part of the pizza that Barney ate.

Barney ate 1/6 of the pizza because the pizza was cut into 6 equal slices, and Barney ate 1 of them.
 
 
 
 
 
 

If George and BamBam didn't show up, then there would be 2 slices left.

2/6 of the pizza would be left.Since there were 4 slices eaten, 4/6 of the pizza was eaten.

This page last updated 21 July 1999