Classify each number as one or more of the following:...

Classify each number as one or more of the following: natural number, integer, rational number, or real number.
$-3.5$ (The amount in billions of dollars that the Motion Picture Association of America estimates is lost annually due to piracy)

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Key Concepts

Natural Numbers

Natural numbers are typically defined as the set of positive counting numbers (1, 2, 3, ...) used for counting objects. They do not include zero, negative numbers, or fractions/decimals, which distinguishes them from other number sets.

Integers

Integers extend natural numbers to include zero and negative whole numbers (..., -3, -2, -1, 0, 1, 2, 3, ...). They do not contain fractional or decimal components and form a fundamental set in number theory.

Rational Numbers

Rational numbers are numbers that can be expressed as a quotient of two integers, where the denominator is not zero. This includes all integers, fractions, and decimals that either terminate or repeat. Such a representation distinguishes them from irrational numbers.

Real Numbers

Real numbers encompass both rational and irrational numbers, representing all numbers that can be found on the number line. This set includes whole numbers, decimals, fractions, and transcendental numbers, providing a complete view of continuous quantities.

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