Kids Riddles

Question:

What is the most common use of cowhides?

Question: If you look at my face there won't be 13 any place.

Question: You have two books. One of them is upside-down and the other is rotated so the top of the book is facing you.

What is the sum of the first page in each book?

Question: I grow from trees and your home,
once I am grown I fall to my doom.

What am I?

Question: Not chest or box is now discussed. Money can be held in it, but just as we test its metal, within it there is rust.

[What is it?]