Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Robert Kelly is managing director of XTS ...

Lagos — There is the need for both the Federal and state governments to encourage the adoption of abacus mental calculation in Nigerian schools if the country is to successfully develop high ...

1095-90 BC: Earliest date of possible origin of abacus calculation in China. Supported by the 1976 archaeological discovery of 90 ceramic beads in Qi county, Shaanxi province. But some believe the ...

Abacus is an ancient calculating tool that can be used for various mathematical calculations like addition, subtraction, multiplication, division or even for basic counting. The design of this tool ...