Eric and the Red Planet

Eric and Erica the bears love numbers. They visit the space base where rockets are fuelled by honey. Eric fiddles with the controls and the two bears shoot off inadvertently to Mars. On the way they eat the spare fuel, so can't get back. Fortunately, Mars is full of honey, so they fill up and shoot home. If you believe that, you'll believe anything. Throughout the adventure, there are lots of numbers and things to count, and visual puzzles to engage you. It's nice to have a book that involves complex and interesting ideas about numbers at a simple level. As long as the story doesn't put you off.