This road sign was found eight miles south of Hannibal, Missouri, on MO Hwy-79.

The road sign says...

+--------------------------+ | Hannibal 8 | | Saverton 1 -> | | Lock & Dam No. 22 2 -> | +--------------------------+the numbers are: 8 1 2 22 the math is: 22 / (8 + 1 - 2) = Pi (3.14) [solve for 'n'] 22 / (n + 1 - 2) = Pi (3.14) more math: 22 / (sqrt(8^2) - 1) = Pi (3.14) off-by-one math: (8 / 2)! - 1 = 22 (+ 1)On 1 July 2006, RoadSignMath.com (RSM) did not have any road signs from Missouri. This sign was submitted to RSM on 27 August 2006.

## Update::2006.11.25

I was notified by RSM that this road sign was no longer valid because of a rule change related to signs that evaluate to mathematical constants such as Pi.

"3) The solution must match exactly for all decimals returned in the equation. You cannot truncate any decimals."The equation

`(22 / (8 + 1 - 2))`

evaluates to`3.142857`

. Pi to six decimal digits is`3.141592`

. In a nutshell, RoadSignMath.com will not accept road signs that use`(22 / 7)`

to approximate Pi.## Update::2009.04.09

This BARS was selected to be one of the BARS of the Week for week #12 of the spring 2009 semester.

the numbers are: 8 1 2 22 rsAgeEval: 2 * 22 + 8 - 1 = 51 * MathBabbler was 51 years young when he found this equation rs42Eval: 2 * 22 - (1 * cuberoot(8)) = 42 * 42 is the "Answer to Life, the Universe, and Everything" off-by-one rsAgeEval: 2 * 22 + sqrt(8 + 1)! = 49+1 * RoadHacker was 49 years young when he found this road sign

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

**Created:** 01 July 2006

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