Level 0.5:
Quote:

A mother and father have six sons and each son has one sister. How many people are in that family?

Level 4
Quote:


[color:"orange"] Highlight the triangle to show the grid behind it [/color]
The second triangle is formed by rearranging pieces used to create the first. Yet there is a strange gap in the second triangle. Has area vanished? Explain why or why not.

Level 4
[quote]
What goes in the blank?
_ T T F F
S S E N T
E T T F F
S S E N T