The Irish Times

Modular arithmetic: you may not know it but you use it every day

You may never have heard of modular arithmetic, but you use it every day without the slightest difficulty. In this system, numbers wrap around when they reach a certain size called the modulus; it is ...
Forbes

This Math Trick Will Let You Find The Day Of The Week For Any Date

One of my fellow contributors here recently wrote a post about leap years and why we have them. This reminded me of modular arithmetic and the formula for calculating the day of the week for any date ...
insider.si.edu

Mathematical Tables, Automatic Arithmetic: A New System for Multiplication and Division without Mental Labour and without the Use of Logarithms

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. The title of this bound set of tables ...
Nature

Automatic Arithmetic: a New System for Multiplication and Division without Mental Labour and without the Use of Logarithms.

THIS is an ingenious work, and would have suited the “fantastical” Armado (“I am ill at reckoning; it fitteth the spirit of a tapster”). By the aid of 1759 figures only the user of it is able to ...