Everyday we use the decimal number system (base-10); however, some programmers sometimes represent numbers using the octal number system (base-8).

The following is an old math joke...

Dec 25 = 31 OctMathBabbler wrote the following on a classroom whiteboard on 31 October 2011.

After looking at the picture later, he wished he written 5x1 instead of 1x5.

**Creator:** Gerald Thurman
[gthurman@gmail.com]

**Created:** 25 December 2011

This work is licensed under a Creative Commons Attribution 3.0 United States License.