All readers (key stage 3 upwards) need to enjoy the "surreal sums and absurd arithmetic" in How to Make a Camel Smoothie is a calculator and an understanding of addition, subtraction, multiplication and division.
Then they can go "number freaking" and explore dozens of weird statistical topics. Do you know how many baths of water you drink in a lifetime, what you weigh in flies or how many bald men there are in the world? The answers are here. So is an explanation of the title, a macabre speculation involving a blender and the eye of a needle. How to Make a Camel Smoothie by Gary Rimmer costs pound;7.99 from Icon Books.