This set of printable worksheets focuses on multi-digit addition (2 to 5 digits) with and without regrouping, helping students in grades 1-3 master this important skill. It includes a variety of engaging activities and worksheets, such as problems without regrouping for beginners, worksheets with regrouping, and missing number worksheets for intermediate learners. Answer keys are also provided for easy grading.  This set includes: adding 3 2-digit numbers with and without regrouping adding 3 2-digit numbers with missing addends adding numbers with 2-5 digits with and without regrouping adding numbers with 2-5 digits with missing addends engaging activity pages for adding 2-5 digits