By Kardi Teknomo, PhD.

Number Pattern Challenge

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Revoledu Challenge

Okay, this challenge is not about digital root but about number pattern. This is just for fun.

Math Challenge

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Download the MS Excel companion of this tutorial here

These tutorial is copyrighted.

Preferable reference for this tutorial is

Teknomo, Kardi (2005). Digital Root. https:\\people.revoledu.com\kardi\tutorial\DigitSum\