Object: A combination lock.

Good morning, boys and girls. Does anyone have a combination lock? (Let them answer.) If you have a combination lock, that is, a lock that has a lot of numbers on it, tell me what you use it for? (Let them answer.) A lot of boys and girls have a combination lock to use on their bicycles. They ride their bikes to school or to the park, and while they are in school or playing, they know that their bikes are safely locked. Once you lock your bike up with a lock like this, then it cannot be moved or taken. Of course, you must remember the combination so that you can open the lock after you have used it. That means that you must have the right numbers and know how to turn the lock in the right directions so that it will open. Knowing the combination is very importan…