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The Magic of Digital Roots with professor Edward Brumgnach

Wednesday, October 15, 2008
22m:07s | 4325 views

The digital root of a number is the number obtained by adding all the digits of the original number, then adding the digits of that number, and continuing to add the digits of the resulting number until a single digit is obtained.

For example, the digital root of 76,254 is 6, because 7+6+2+5+4=24, 2+4=6.

Digital roots can be used to check the correctness of arithmetical operations.

Digital roots can also be used to perform what seems to be “magic”.

Website: http://www.qcc.cuny.edu/ecet/Faculty/brumgnach.asp
Presenter: Professor Edward Brumgnach of the Electrical and Computer Engineering Technology Department