Calculating Machines --- Abacus --- Napier's bones --- Slide Rule --- Logarithms --- CalculatorWhen small children do simple sums, they like to count on their fingers. It's always easier to deal with numbers if you have something to help you. Here are some of the machines that have helped with calculations. The oldest is the abacus, which has been used since before 1000 BC.
Stand alone pagesSimple abacus
© Jo Edkins 2007 - Return to Numbers index