Math operations Adding three numbers Adding three numbers: Practice adding three numbers. Level game: 2nd, 3rd and 4th grade Math games recommended for You: Counting with money 2nd grade3rd grade4th grade Share this Practice math games: Choose the biggest number (to 20) Long addition (three numbers) One-step equations (addition) Leave A Comment Cancel reply Save my name, email, and website in this browser for the next time I comment.