What is the correct way to strum a ukulele?
Strum with the index finger of your right hand, fingernail side down. When you strum down, you should be hitting the strings with your nail. When you're strumming up, with the fleshy tip of your finger. It is important to use your wrist rather than your whole hand.
How many fingers do you strum with?
Basic Fingerstyle Strumming
If you tried to strum with three fingers the same as you do when strumming down, your fingers would get caught up in the strings. So using just your first finger is smoother. For both strumming down and up be sure and keep your right hand relaxed.