The collection of mathematics (mechanical computing technique) is relatively young. Until 1960 it comprised 30 exhibits only. In the period of 1960s to 1980s it was completed with discarded computation technique from offices and enterprises. It contains various calculating devices, from the most simple ones to electronic office machines and calculators. The collection is divided into aids (logarithmic, summing machines of the type Produx, Comtator, Adix), manual and electric calculators. The collection comprises 183 exhibits. Interesting machines include calculating drums Blitz, Cubus and mechanical calculators from the 19th century.