Addition, Grade 2 is in the "Kumon Math Workbooks: Calculation Skills" series designed for grades 1-6. This workbook will introduce students to subtracting one-digit numbers from one-and-two digit numbers. Exercises include drill addition problems as well as exercises where students fill in the missing numbers by using addition patterns. Activities also emphasize horizontal addition review; vertical form addition; two-digit plus two-digit addition to 198; the commutative property of addition; patterns & sequencing; and more.