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The set {1,2,3......}
Natural numbers

The set {0,1,2,3,.....}
Whole numbers

The set{...2,1,0,1,2...}
Integers

A number greater than zero
Positive numbers

A number less than zero
Negative numbers

The set of numbers expressed in the form of a fraction a/b, where a and b are integers and b doesn't equal 0
Rational numbers

Lines and sets that never end, continue to infinity
Infinity

The absolute value of a number n is it's distance from zero on a number line and is represented by n
Absolute Value

Every positive rational number and it's negative pair
Opposite

A number and it's opposite are additive inverses of each other. The sum of a number and it's additive inverse is 0.
Additive Inverse

One of two equal factors of a number
Square root

A number whose square root is a rational number
Perfect Square

The symbol used to indicate a nonnegative square root
Radical sign

Numbers that cannot be expressed as terminating or repeating decimals
Irrational Number

The set of irrational numbers and the set of irrational numbers together
Real Numbers

A rational number that is close to, but not equal to the value of am irrational number
Rational Approximation

