There will be three books (A, B, C, taped so they cannot be opened) near each other and a person that will be helping out.  There will also be a sheet to write the name of the child and the number of pages they think are in book C.  At 7:30 we will announce the answer (anotehr option is just to write the number and not the name so Egos will ot be inflated.  What do you think?

 The instructions will be:

Write your guess as how many pages you think are in book A without opening it.

Then open it.

Then guess how many pages you think are in book B without opening it.

Then open it

The guess how many pages are in book C without opening it

Write your name and the guess.