Math operations Addition to 20 Addition to 20: Practice adding numbers from 1 to 20. Level game: 1st and 2nd grade Math games recommended for You: Addition to 20 – find a number Addition to 10 Subtraction to 20 1st grade2nd grade Share this Practice math games: Comparing numbers (to 10) Addition to 100 – find a number What time is it? Leave A Comment Cancel reply Save my name, email, and website in this browser for the next time I comment.