This fun book is a perfect way to introduce young children to simple addition and subtraction, allowing them to practise time and time again using the special pen on the durable wipe-clean pages. There are numbers and pictures to trace over on every page to develop pen control and practise early maths skills. The lively illustrations and friendly characters keep children engaged and make learning fun. At the back of the book there are notes and tips for grown-ups, a useful fold-out number formation guide and links to recommended websites.