Mental Math in the Middle Grades Author:Jack A. Hope, Barbara Reys, Robert Reys Play "mind games" in the classroom with 36 reproducible lessons that make it easy for students to add, subtract, multiply, and divide in their heads! Power Builder practice sets, step-by-step teaching notes and transparency masters, answers, progress tests, and "Mental Athlete" anecdotes make this a fun way to teach math computation. Grades 4-6