Digital Root

By Kardi Teknomo, PhD.

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One day I talked about recognizing patterns from numbers, many students just stared at me with blank face. When I introduce digital root or digit sum to them, their puzzling faces suddenly disappear. They could recognize the pattern easily, even the younger one. Some are actively pursue their own discovery on mathematical pattern.

The idea of digit sum or digital root is very old but it is very interesting. It is a mind exercise to guide students discovers patterns and simple formulas by themselves. This kind of exercises does not require high mathematical knowledge (basically, only addition and multiplication); instead it will serve as a mean for mathematics teachers to support the students to explore fascinating pattern and the beauty of mathematics.

In this tutorial you will learn about (click the following topics):

Motivating Example
What is Digital Root?

Digital root code in VB (MS Excel Macro)

Pattern of Digital Root
Vedic Square

Making Vedic Square using Matlab

Arithmetic of Digital Root
Group of Digital Root
Power of Digital Root
Digital Root Resources (including References)

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This tutorial is copyrighted.

Preferable reference for this tutorial is

Teknomo, Kardi. Digital Root. http:\\people.revoledu.com\kardi\ tutorial\DigitSum\