Mathematics+activity!

1. The Roald Dahl activity

= 112589907 km thick.
2. The chessboard activity

=== Q) There was a peaceful kingdom but gangs came to kingdom and killed many people and steal many things. So king said "If someone kill the gang, I`ll give a big prices. So many people tried to kill gangs but they always can't kill them. One they a man defeated all of the gangs. So king made him to choose the prize. ===