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Although they deal with addition, subtraction and multiplication of numbers, these programs will not teach such complex processes. They merely provide the opportunity to practise what has already been learned in an enjoyable way.

The presentation of the cassette is excellent, both visually and textually.

The programs - written for Mirrorsoft by Widgit - are equally good, with superb use of colour and shape, though the Spectrum's screen shimmer makes reading numbers difficult.

Sum Vaders has a mothership dropping robots; add the numbers on each to destroy the robot before it reaches earth. When five land, the game is over.

In Robot Tables, the child must decide whether a piece of raw material is to be accepted or rejected before reaching the robot making machine.

To be acceptable, they must have the next number in the chosen table sequence, for example 2, 4, 6 ...? Make the wrong choice and all sorts of fascinating things happen. Great graphics!

Criticisms? Robot Table practises tables in sequence, but then we use them out of sequence in everyday life. It needs a random element.

D.M.