Loreen Leedy. 2 X 2 = Boo!: A Set of Spooky Multiplication Stories. New York, Holiday House, 1995.

How do you turn one bag of candy into five? Find out in this frightfully fun multiplication story! Full of basic multiplication facts and funny Halloween-themed illustrations, Loreen Leedy's 2 x 2 = Boo! is a perfect introduction to this important mathematical operation. Six cute, cartoony stories will teach young readers how to multiply from 0 to 5 in a memorable, kid-friendly way. Cute, clever, and just the right amount of creepy, this entertaining and educational title is a great fit for elementary school students brushing up on their math skills, or anyone who loves bats, vampires, and more Halloween candy.