In which I try to explain how to subtract 9 from 25.
hat's how many plastic bags were reused by the customers of the Prestwich branch of Tesco last week.
What's the missing number?
New Scientist interview with mathematician Christopher Zeeman.
One in 14 adults cannot answer a maths question aimed at eight-year-old children.
Adding cream cakes to the colour blue.
How to work out what year it will be next year.
Lively 2,300-year-old proof that there is an infinite number of primes.
Fibonacci numbers in nature are sometimes myths.
Richard fails to explain the significance of pi.