This Addition & Subtraction Unit covers 2-digit and 3-digit addition & subtraction. It includes practice worksheets, center activities, strategy posters, lesson ideas, and a unit test. It focuses on using mental math strategies and the traditional algorithm to solve problems. It is based on the 2020 Ontario Curriculum and covers expectations B2.3, B2.4 & B2.5, but can be used by anyone looking for 2 & 3-digit addition and subtraction activities. A digital version is also included. A link