Without a pocket calculator of course! This game starts easy, with the five times table. Every time you've done one right, in one go you will be challenged to do the next one up.

But beware, you've got only a limited amount of time! The progress bar (on the next page) will be displayed in green if you're on schedule if it's in red you need to catch up!

Consider this as a fun example what can be done with interactive web pages... Ready?