Awesum Alex, Math Detective: The Subtraction Problem
by Rachel McAnallen and Carol Ann Williams
The story about Gray is a tale of a young girl who goes to a new school and discovers, not just new friends, but a new way of approaching subtraction. Gone is the old method of crossing out smaller digits above the larger digits, which confuses the issue of place value. Instead, children will learn alongside Gray, Alex, and their friends that there are several ways to do subtraction. Ways that allow them to use the fundamental mathematical concepts logically and have fun in the process.In this volume, creative math educators Rachel McAnallen and Carol Ann Williams explain how to take the mystery out of subtraction.