## Saturday, October 22, 2022

### Map Folding Problem

The lines in the map above show how it was folded.  Dotted lines show a “valley fold” and solid lines show a “mountain fold.”  This map was folded in half horizontally, then vertically, then vertically again.

Question:  Each of the maps below was folded in four steps – in half each time.  Which of the maps is an “impossible map”?

Also check out my new project: musical math videos. Subscribe to the YouTube Channel to get more as they are released!

## Thursday, October 13, 2022

### Prime Time!

A new song!

Welcome to Prime Time Building Supply! Imagine a store  that sells prime numbers. We sell classics like 2, 3, 5, or 7. We also sell the elegant and understated 1009. With our prime numbers, you can build composite numbers of any size!

The song:  Prime Time

## Wednesday, October 5, 2022

### Gauss’ Trick

I am happy to announce the launch of a new project. This is the first in a series of musical math videos. Please enjoy and share this song about the mathematician Gauss as a little boy and his trick for adding the numbers from 1 to 100.

Musical video:  https://youtu.be/XlGsUlIEdYc

Companion video explanation of Gauss' method:  https://youtu.be/fTluDWc1v-A

### PLAYFUL MATH BLOG CARNIVAL #163

BLOG CARNIVAL #163....LET'S GO! Fun fact: The number 163 is prime, which we can prove simply by showing that it is not divisible by 2, 3...