To sign cents, hold out the index finger while the rest of your dominant hand is held in a fist, with palm facing out. Touch the backside of your index finger to your forehead, then move your hand down at an angle and away from your face. You can also sign the exact amount of cents you are talking about. For example: 10 cents.
Teach your baby or toddler the cents sign in the context of counting money. Just be sure to get the foundation of number signs down first, before you start talking about cents and dollar bills.
This is a useful flash card taught best in conjunction with laying the foundations of counting numbers, saving money, and spending it wisely with simple purchases.