To sign "twenty-five," hold your dominant hand up with your palm facing forward and your fingers spread apart in a "5" handshape. Keep your hand still while you bend your middle finger forward and down a couple of times. The other fingers should remain straight and pointing upward.
Sign "age" by pulling an "O" handshape down from your chin, then sign "twenty-five" by holding up a "5" handshape and wiggling your middle finger forward.
Sign "cost" and "dollar," then sign "twenty-five" by keeping your palm facing forward and bending your middle finger down repeatedly.
Sign "class" and "student," then indicate the quantity by signing "twenty-five" using the open handshape with the wiggling middle finger.
Sign "age" by pulling an "O" handshape down from your chin, then sign "twenty-five" by holding up a "5" handshape and wiggling your middle finger forward.
Sign "cost" and "dollar," then sign "twenty-five" by keeping your palm facing forward and bending your middle finger down repeatedly.
Sign "class" and "student," then indicate the quantity by signing "twenty-five" using the open handshape with the wiggling middle finger.
While signing "2" followed by "5" will generally be understood, it is not the standard way fluent signers express "twenty-five." Using the single handshape with the bending middle finger is much more natural and efficient in ASL.
Typically, you bend or wiggle your middle finger two or three times in a quick, fluid motion. It doesn't need to be a strict count; just a brief flutter is enough to convey the number clearly.
Your palm should face outward, toward the person you are conversing with. This is the standard orientation for double-digit numbers ending in 1 through 9, with the exception of double numbers like 22 or 33, which face down.
