KUMON Math Boosters: Addition & Subtraction Grades 1–3 builds strong early computation skills through structured, step-by-step practice aligned with Ontario mathematics expectations for the Number strand. This workbook develops mental math and number fluency, addition with increasing place value (including multi-digit), subtraction with regrouping, and mixed addition and subtraction practice. Carefully sequenced exercises help students build calculation speed and accuracy while strengthening number sense and confidence. Using the proven Kumon progression, students move from understanding → accuracy → fluency through repetition and gradual increases in difficulty, supporting success in Grades 2–4 mathematics.