# Browsing category basic maths skills

## Exchange rates on board

"Three teas, please," said the passenger ahead of me in the queue. The Armorique was due in Plymouth any minute, and tea was of the essence. "That's £4.65, or €5.601." Hang on a moment, I thought, remembering to order my own tea as well. 560 isn't a multiple of 3.

## TMTOWTDI: Subtraction

"There's more than one way to do it." - Perl programming motto One of my few regrets about writing maths books is that I usually only get to show one way of doing things - and that gives the impression that I believe Method X is absolutely, no questions, the