P. H. Nygaard, Solution of Equations by Addition-Subtraction Logarithms, The American Mathematical Monthly, Vol. 37, No. 9 (Nov., 1930), pp. 486-491 ...

Femcifrede Logaritmer og Antilogaritmer (Five Figure Tables of Logarithms and Anti-Logarithms). By A. K. Erlang. Udgivet ved (edited by) R. E. H. Rasmussen. Pp. 48.

Addition and subtraction of numbers in logarithmic form is difficult because it involves evaluating a non-linear mathematical function. Using a look-up table of pre-calculated results can speed ...

eCalc is a free Web-based calculator that can handle everything from basic addition and subtraction to logarithms, cosines, and unit conversions. Not online? There's a new desktop version of eCalc ...

Researchers from 4 projects with a problem-solving approach to teaching and learning multidigit number concepts and operations describe (a) a common framework of conceptual structures children ...

In this KS2 Maths article you'll find out how to use mental methods when doing addition and subtraction in your head. We also have KS2 Maths videos, a quiz and lots of examples.