Freddie Manners, of Packwood Haugh School in Shropshire solved an alphanumeric without using the extra information supplied and this article explains his reasoning.
Many numbers can be expressed as the difference of two perfect squares. What do you notice about the numbers you CANNOT make?
Relate these algebraic expressions to geometrical diagrams.
This article explains how to make your own magic square to mark a special occasion with the special date of your choice on the top line.
There are lots of different methods to find out what the shapes are worth - how many can you find?
Can you use LOGO to create a systematic reproduction of a basic design? An introduction to variables in a familiar setting.