Book Description: Meet Zero, a bubbly fellow who will dissolve you to nothing, and say hello to the all-action Units, who just love to measure. Get a load of greedy Multiply, a big guy who hoards numbers together, and stand amazed by mysterious Pi, who goes on and on and on . . . to Infinity! Multiply your number know-how with Basher’s unique one-stop guide to the building blocks of mathematics. Packed with top tips and memorable characters, this is an essential book for students ages 8 and up.