This collection of our addition worksheets includes seventeen types of activities that can supplement your lessons. It covers adding 1, 2, 3, and 4-digit numbers with carrying and without or no regrouping. The activity types include standard algorithm addition, vertical, horizontal addition, missing addend, adding three numbers, fill-in-the-blanks, using a grid, matching columns, and more. You can use these worksheets as a review, homework, quiz, test, assessment, math center, station, or practi