How many socks make a pair?
Maths for Mums and Dads


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 and children that range from small interactive workshops to keynote lectures in front of several hundred. I've also done lots of radio, including BBC Radio 4, 5Live, Radio 3 and 2, but not 1 or 6...yet.

Recent Blogs

Trams, taxes and cliff edges
3 July 14

The new Edinburgh tram has a strange connection to stamp duty more...

Fronted Adverbials and other Pointless Jargon
10 May 14

This morning I discovered some new jargon. And I'm annoyed. more...

27 April 14

Before playing Chelsea, Liverpool won 11 League games on the trot. They had momentum. But what does that mean? more...

How to Teach Maths
4 February 14

If exams didn't exist how would I teach maths? And what maths would I teach? more...

What's the maths difference between boys and girls?
24 January 14

Segregating boys and girls for a lesson had some interesting results. more...

England could have won 5-0
6 January 14

The post mortems into England's 5-0 thrashing have begun. Yet it could have been very different. more...

When the Birthday Coincidence Goes Wrong
29 November 13

The birthday coincidence is a lovely way to demonstrate how probability can be surprising. Except when it goes wrong. more...

Three Sevenths
18 November 13

Primary school children deserve the chance to discover how to turn fractions into decimals more...

The Irksome Tuesday Boy Problem
3 November 13

The answer to this 'classic' puzzle depends entirely on the motives of the person who poses it. more...

Recent Tweets

The curse of the BBC Sports commentator's anti-smartness (usually maths/science) prejudice from @icecolbeveridge

2 days ago

Remember that while London house prices went up by 20% in the year to June, they only have to go down by 17% to be back at same level.

2 days ago

How does Google google? One of a series of nicely produced short TV films by Portugese mathematician Rogerio Martins

2 days ago

Bad bruise on arm playing cricket. Rest of team recommend arnica. Any scientific evidence to support it @slsingh? #mandarinscc

5 days ago

"Schools should devote as much time to dance as to maths". Ken Robinson populist twaddle debunked by @tombennett71

7 days ago