How Many Skeletons in This Creepy Haunted House? Use Math to Find Out! Welcome to the haunted house of basic algebra. No need to be scared, though. The mysteries here are as easy to solve as a, b, c — or any other letter that stands for an unknown number. Using pumpkins, black cats, owls, spiders, skeletons, and bats, this learning aid gracefully glides through such concepts as balancing both sides of an equation, working with variables, using basic math functions to solve word problems, and much more. The illustrations are ooky and fun. The examples and explanations are frighteningly clear and understandable. And the many practices and word problems brighten any dark hallways that might appear along the way. And Igor the caretaker is always around to lend a bony green hand. During lunch, 12 bats suddenly fly inside the house. Now there are 27 bats. How many bats were around before lunch? There are 5 rooms in the haunted house. Each room has 4 skeletons in it. How many skeletons are in the house? To figure these out algebraically, flip through the pages of this entertaining book and creak around. The questions are screaming to be answered. A hands-on activity further illustrates the topic by showing students how to make and use a balance scale.