When can we add 2 to 11 and get 1 as the correct answer?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

Imagine you are in a room with no windows or doors. How will you get out?

First, think of the colour of clouds. Next think the colour of snow. Last, think of the colour of the moon. Now, what do cows drink?

Buy me, smell me or deliver me, I do not change.

Who am I?

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?

It has five wheels, though often think four, You cannot use it without that one more, You can put things in it, you can strap things on top, You can't find it in the market, but you can still go shop. What is it?

Can you count the number of squares in the figure below?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

I look at you, you look at me, I raise my right, you raise your left. What am I?