Logic riddles for teens with simple answers

I travel all over the world, but always stay in my corner. What am I?

Had at work day and night, it counts the numbers over and over. Although it counts all its life, it never gets past twelve.

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

A father's child, a mother's child, yet no one's son. Who am I?

What is it that when you take away the whole, you still have some left over?

What belongs to you but others use it more than you do?

I am something to make you think, I am something to make you know. I am something to which the answer you might never know. What am I?

What does this rebus say? XLR8.

What has no beginning, end, or middle?

Think of a number. Double it. Add ten. Half it. Take away the number you started with. What is your number?