Every kid can go on a fun math adventure! Oh, no: the evil Mister X has smashed an ancient tablet containing all the numbers of the world-and if Tommy and Tina can't mend it by midnight, every number will disappear forever! Are Tommy and Tina up to the mission? Fifth-graders can help them succeed by doing calculations to avoid traps, figuring out which footprints to follow, and solving puzzles to enter an enchanted tower. Through this combination of storytelling and entertaining activities, even reluctant learners can grasp basic mathematical principles and begin to love the world of numbers. Each book has colorful stickers to place on the pages. An addition to the bestselling Flash Kids line of books.