software . 2018

Tables For Addition And Subtraction With Better Use Of The Place Value System

Colignatus, Thomas;
Open Source English
  • Published: 05 May 2018
  • Publisher: Zenodo
This notebook presents tables for addition and subtraction that have a better use of the place value system. The method is already used in Holland for addition in levels but this notebook extends for addition in differences and subtraction in levels and differences. The method is only intended for an intermediate stage in teaching before addition and subtraction are mentally fully automated. For example 99 + 21 can be added per digit position. To keep digits in the range [0, 9] we remove underflow or overflow. We work from right to left, since the numbers come from India and Arabia. Then we get 99 + 21 -> {9, 9} + {2, 1} = {11, 10} = {11, 10} + {1, -10} = {12...
free text keywords: mathematics education, elementary school, Mathematica, Wolfram language
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