There are three tables.
On the first table there are three bars of chocolate.
On the second table there are two bars of chocolate.
On the third table there is one bar of chocolate.
One person sits down at a table at a time. 
How does the fraction change of chocolate that each child (or adult) would get change?
Which table would you sit at to get the most?
Why did some children get three squares of chocolate and others eight?

What a blissful afternoon this was. The concentration and attention to detail was first class.