Kids Riddles

Question: A natural state, I'm sought by all.
Go without me, and you shall fall.
You do me when you spend,
and use me when you eat to no end.

What am I?

Question: How do you make the number one disappear by adding to it?

Question: How many letters are in the answer to this riddle?

Question: I'm number three.
But I'm not a number.
I'm hot and cold at the same moment but not at the same time.
I'm number three.
But I'm not a number.

Who or what am I?

Question: Many have heard me, but nobody has seen me, and I will not speak back until spoken to.What am I?