This is the 182nd edition of the The Carnival of Mathematics, a blog with a rotating cast of authors that summarises all the fun and intriguing bits of maths that the internet has served up in the previous month. This edition will begin — as has become traditional — with facts about the number of […]

# Author Archives: zoelgriffiths

## What’s Wrong with Geistes Blitz (Ghost Blitz)?

Here is a video I made about the maths of one of my favourite games ‘Geistes Blitz’ (Ghost Bliz). In investigating Geistes Blitz, I made a new game ‘Shape Match’ which I call the ‘mathematically sensible’ version of Geistes Blitz. It has a nice mathematical property that Geistes Blitz doesn’t have. You can download and […]

## Binary Memory Tricks

This is a video about some tricks that use binary to make them work. For anyone at the UK Annual Maths Jam Gathering 2019 – this is an explanation of how I did the coin flip trick in my talk. https://youtu.be/QtFtfD6cG1U Here is a website I used to help me practise: http://www.shodor.org/interactivateJS/Coin/Coin.html Annual Maths Jam […]

## Pascal’s Puzzles and Patterns

This post is about Pascal’s Triangle related puzzles and the value of re-framing problems in multiple different ways in order to draw our attention to alternative solutions. I’ve seen multiple Pascal’s Triangle related puzzles that look something like this. You have a 6 by 6 square grid and a counter. The counter can start in […]

## Cycling Numbers

What do 13, 37, 41 and 91 have in common? They are all cycling numbers*! What are cycling numbers? Try this trick about the number 37: • Take a three-digit multiple of 37 (for example 481). It will be more interesting if all the digits of your multiple are different. • ‘Cycle’ it (re-write it […]