Some Interesting Multiples of Nine: Use Your Digits to Get the Digits!

Author(s)

Kevin Hurley

Document Type

Article

Publication Date

2004

Abstract

We have unraveled two neat and powerful algorithms for calculating certain multiples of nine. These discussions might make for an interesting introduction to a number theory course, or a supplemental project in calculus or advanced algebra. The mathematics involved is within a student’s grasp, and the results are quite startling.

Disciplines

Mathematics

eCommons Citation

Hurley, Kevin, "Some Interesting Multiples of Nine: Use Your Digits to Get the Digits!" (2004). Undergraduate Mathematics Day: Past Content. 2.
https://ecommons.udayton.edu/mth_epumd/2