These web pages will walk you through some easy arithmetic. It will be mostly multiplication and division. The arithmetic will help you figure out how to build your models. A simple pocket calculator will come in handy. If you like to play with numbers, using a calculator as you view these pages will teach you a lot. You'll see some very big numbers as you make your Earth-Moon model.
Here are some things you should remember:
1,000 times 1,000 = 1,000,000 (a million)
1,000 times a million = 1,000,000,000 (a billion)
1,000 times a billion = 1,000,000,000,000 (a trillion)
Millions, billions, and trillions. All are used in making models of the universe.
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