bodmas blog

What is the smallest number of squares of different sizes that can be joined together to make a square? Answer: 21

Try using 4 colours to colour in some maps – harder than it looks

Java applets and some DHTML Javascript can be used for educational purposes- and you don’t have to code a line

Controversial replica calculating machine is based on a sketch in a ‘misplaced’ manuscript by Leonardo

Some links to examples of constructions of common shapes and online drafting aids