Best riddles for kids

What goes up when the rain comes down?

If 20 blackbirds are on a fence and you shoot one, how many remain?

It will never ask you any question, but you will still answer it. What is that?

What is the value of 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/9 of 9/10 of 1000?

Farmer Brown came to town with some watermelons. He sold half of them plus half a melon and found that he had one whole melon left. How many melons did he take to town?

When is your uncle's sister not your aunt?

I travel all over the world. But I could not move, just stay in a same single spot. What Am I?

Dean Sam and Castiel are three brothers. Interestingly their current age is prime. What's more interesting that difference between their ages is also prime. How old are they?

What was the biggest island in the world before the discovery of Greenland by viking Erik the Red?

There is a boat with a ladder attached to it, the ladder is eight feet tall. If the water rises four feet how much of the ladder will be on top of the water?