Cracking corny jokes may not be an obvious method of making the numeracy strategy more effective, but Murderous Maths proves it's possible. In an action-packed 100 pages, the book provides dozens of brain-benders - variously classified as devious, drastic or diabolical - to engage adventurous key stage 2 minds. There are number crosswords, calculator puzzles, mazes, statistical conundrums and many other silly-sensible mental challenges. Beneath the non-stop fun, serious mathematical principles are being investigated. And it's very hard to resist a fractions problem about a TV show called "Win a Warthog with Titus O'Skinty". Murderous Maths by Kjartan Poskitt costs pound;5.99 from Scholastic.