Complete Collection for Parents
Maths on the back of an Envelope
What is a Googly?


I've written or co-written eleven books, some of which have appeared in several languages. The majority are about the maths of everyday life, but I've also written books on cricket, memory and creative thinking.



I am Director of Maths Inspiration, a national programme of interactive lecture shows in theatres that has reached over 100,000 teenagers in the last ten years. I'm closely involved with the UK maths community, from primary schools to universities.


Talks & Radio

I give talks to adults, teenagers and children that range from small interactive workshops to keynote lectures in front of several hundred. I've also done lots of radio (including numerous appearances on BBC Radio 4's More Or Less) and many podcasts.

Recent Blogs

Goodbye, Puzzle for Today
18 August 20

Two years ago, Radio 4's Today programme introduced a daily puzzle - an interesting idea, but it had several serious flaws. more...

Jeremy Wyndham
2 August 20

A tribute to my friend and co-author Jeremy Wyndham more...

The Wastage of Pencil Sharpening
29 May 20

How much of the lead in a pencil do we actually use? The answer is that we waste almost all of it. more...

The H-Coins puzzle

The H-Coins puzzle
19 May 20

A wonderful and little known coin puzzle, ideal for doing on a pub table. more...

The hidden maths of the coxcomb chart

The hidden maths of the coxcomb chart
18 May 20

Florence Nightingale has been celebrated for her use of statistics to fight disease, but one clever feature of her charts has had little attention. more...

False Positives go mainstream
24 April 20

The idea of false positives has always been of peripheral interest to the general public. Covid 19 has changed that. more...

The Risk of Floods
24 March 20

When reports say 'This is a once in 100 year flood' what does that mean? more...

A silver lining to Coronavirus?
23 March 20

Amid the justified gloom and worry about coronavirus, there are signs that there might be a silver lining. more...

The history of the six yard box
16 February 20

The markings of the penalty area in football had a strange evolution. more...

Estimating the spread of the Coronavirus
18 January 20

When we hear forecasts in the news, the numbers imply a confidence that is rarely justified. more...

The Number Column Puzzle
2 December 19

Some puzzles involve some lateral thinking. But when does a 'creative' answer become 'cheating'. more...