Each number on the clock is represented by a mathematical equation - work out the equation to reveal the number. Of course, you know what the number will be by its position on the clock face - which makes it all the more frustrating when you know the answer but can't work out the equation! (hint: ask a 10 year old ...)
The clock comes in two styles - 'blackboard' and 'graph paper' - both of which are designed to complement the 'old school' theme.
If you're looking for something different to buy for one of those people that is difficult to buy for, perhaps The Mathematical Clock is the answer.
For more information, click here - a great fun gift for Birthdays or Christmas.