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It is a proven fact that Math may be more enjoyable and less stressful when your child grasps and develops fundamental abilities. Hundreds of arithmetic facts for fast, entertaining learning are included in the I Know It Addition & Subtraction Grades 1-2 workbook, along with clear directions and step-by-step examples for you and your kid to follow. The lessons' sequence is specially designed to build on the knowledge acquired from the previous lessons. The Common Core State Standards for Mathematics provide a comprehensive and progressive set of learning objectives to help children succeed in math. They are all aligned with this workbook. At the bottom of each workbook page, a cross-reference to the Common Core grade level and "domain" or skill area that the exercise focuses on. The workbook is also in line with the National Council for Teachers of Mathematics Principles and Standards for School Mathematics.