If you say my name, I will no longer exist. What am I?

If a wheel has 54 spokes, how many spaces are there between the spokes?

Do You See It?

Can you write down eight eights so that they add up to one thousand?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

What jumps when it walks and sits when it stands?

How many times can you subtract the number two from the number fifty?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?