Math operations Subtraction to 20 Subtraction to 20: Practice subtracting numbers from 1 to 20. Level game: 1st and 2nd grade Math games recommended for You: Subtraction to 20 – find a number Subtraction to 10 Addition to 20 1st grade2nd grade Share this Practice math games: Over, under Learning clock Greater than and less than sign (to 50) Leave A Comment Cancel reply Save my name, email, and website in this browser for the next time I comment.