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Arithmetic
Arithmetic is the study of certain kinds of numbers and ways they can change each other.
Usually today arithmetic is about numbers bigger than zero which are real numbers.
The things you can do in arithmetic are addition, subtraction, multiplication and division.
The name comes from the Greek word arithmos which means "number".
Arithmetic has many practical uses in daily use. For example, adding up prices at the store. Or figuring out the tip at a restaurant.
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