Since numbers first emerged, people have used their fingers and toes, abacuses, electronic calculators and mobile phone apps to make calculations. This video considers how calculators have changed through time.
OpenLearn - Basic science: understanding numbers
Except for third party materials and otherwise, this content is made available under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence, full copyright detail can be found in the acknowledgements section. Please see full copyright statement for details.