ABACUS/TheBasics - Version 3.0 With pocket calculators so popular these days, it is hardly surprising that mental arithmetic skills are not as sharp as they used to be. ABACUS/TheBasics is a math training tool which enables children and adults to improve their arithmetic skills in a stimulating and enjoyable way, taking advantage of up-to-date technology together with to-the-point Tips 'n Tricks. ABACUS/TheBasics offers a flexibility which makes it suitable for kids (at school and at home) as well as for adults who want to brush up their skills.