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### Arithmetic: A Review

Arithmetic is the area of mathematics that involves making computations with real numbers. These computations are done using four basic operations: addition, subtraction, multiplication, and division. Let's begin our review with the alphabet of arithmetic: numbers. Table 2.1 provides a refresher on the various types of number sets you will encounter. Take a moment now to review the differences between each set of numbers so that on the test you won't have to stop to think what is meant by a “real number” or an “integer” before solving a problem.

Table 2.1. Types of Number Sets
Name of SetDefinitionExamples
Natural numbersThe counting numbers (that is, positive integers)1,2,3,4…
Whole numbersThe natural numbers and zero0,1,2,3,4… ...

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