When your child understands and develops key skills, math can be more fun and a lot less stressful. In this 'I Know it!' Addition & Subtraction Grades 1-2 workboo, you'll find hundreds of math facts for fast, fun learning, with clear instructions and step-by step examples for you and your child to follow. This first grade workbook covers addition & subtraction in hundreds, tens, and ones; fact families; regrouping; using a number line; place value and order property, and more. Colorful illustrations and engaging activities teach and reinforce place value, regrouping, and more. 64 pages, softcover. Answer key included.