School Zone - Addition & Subtraction Workbook - 64 Pages ... School Zone - Addition & Subtraction Workbook - 64 Pages, Ages 6 to 8, 1st & 2nd Grade Math, Place Value, Regrouping, Fact Tables, and More (School Zone I Know It!® Workbook Series) [School Zone, Joan Hoffman, Barbara Bando Irvin, Ph.D., Shannon M. Mullally, Ph.D.] on Amazon.com. *FREE* shipping on qualifying offers.