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

Books

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.

maths-and-puzzles

Maths

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-and-radio

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

Problem Solving and Jardin's Principle
2 October 14

A universal syndrome that is often observed but doesn't have a name. Well it does - but hardly anyone knows it. more...


It's all the fault of my Inner Chimp
22 August 14

How motivational speakers make use of pseudo-neuroscience more...


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...


Momentum
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

My FREE @mathematical_a talk Lancing College Brighton Tue 18 Nov 4.30pm 'From Pepsi to Peace deals' To book email p.j.harris@brighton.ac.uk

about 13 hours ago

I've just pre-ordered @standupmaths new book in the hope it might be pre-delivered in time for half term hol reading http://t.co/Ri4iONG2Iz

about 14 hours ago

Today @mathsinspiratn celebrates its (our) tenth birthday. Thanks @plusmathsorg for lovely tribute http://t.co/EoX3IpoSP2

1 day ago

...and if you can't wait two weeks, @alexbellos speaking tonight, also in Chester http://t.co/5DTmEy6qwS

3 days ago

Near Chester? My game theory talk on 4th Nov at 4pm. Book FREE tickets here: https://t.co/KYYfE2TF3p@kscmaths

3 days ago