Mystery Math

Gr 3—6—Adler uses a mystery conceit to introduce algebraic equations and problem solving. Collaborating again with Miller, and using a Halloween theme, he employs the concept of a "mystery number" or variable that creates balance in an equation, showing how those numbers will be represented by letters. He begins very simply with illustrated examples of equations that many readers will be able to do in their heads. Once the concept is established, he continues with problems that require addition, subtraction, multiplication, or division in order to solve the "mystery," or equation. Each of the problems is posed in the form of a dilemma for characters Mandy and Billy, reinforcing that there are real-world applications for the skill. Adler sometimes uses the initial letter of the represented object in naming the variables ("K" stands in for "kittens," and "R" for "ravens"), but does not use this effective connection consistently. Miller's trademark wit and collagelike digital illustrations guide readers with visual references to the problem. The white font on dark pages is easy to read. The use of pumpkins and other Halloween icons may create too tight a niche for this title, and differences among elementary math programs may affect its usefulness, but overall Mystery Math presents the concepts with humor and clarity.—Lisa Egly Lehmuller, St. Patrick's Catholic School, Charlotte, NC