How to Sign "21" in American Sign Language (ASL)

Show "2" with your dominant hand by making a V shape with two fingers, then quickly change to "1" by keeping just your index finger up. This basic number sign in ASL follows a simple pattern of putting two digits together to make numbers from 10 to 99. You'll see people use this fast, smooth movement all the time when they're signing about ages, dates, or counting things. The motion should flow naturally from the "2" position straight into the "1" position without stopping.