This package differs from the other formats in that it will ask a question and if your answer is wrong will give you a clue to the formula required. If you don't get it right a second time it then provides the correct answer but also tells you how it arrived at the answer As the calculations are likely to got a bit lengthy depressing function key 0 will break the program and allow you to use the Amstrad as a calculator Fressine function key 0 or 1 takes you back. Both sides of the disc are used. Side one covers such subjects as percentages and fractions, ratio and proportion, base numbers etc. Hip the disc and you move on to gcometrv algebra and calculus.