Thomas Canavan 
Computation Skills [PDF ebook] 

The 50 fun and engaging puzzles in this book will help students to hone their computation abilities. All of the puzzles are written in easy-to-follow language and carefully designed to help young readers increase their speed, confidence, and ability in solving computation problems both in the classroom and in real life. Each page of the book features a different puzzle intended to enhance the development of necessary computational skills. The book’s content and methods correlate closely with National Council of Teachers of Mathematics (NCTM) standards.