Unit 5: The Number System

Natural Number

The set of numbers 1, 2, 3, 4, ... also called counting numbers.

Repeating Decimals

a decimal in which one or more digits repeat infinitely

Terminating Decimal

a decimal number that ends or terminates

Rational Number

a number that can be written as a fraction

Irrational Number

a number that cannot be expressed as a ratio of two integers or as a repeating or terminating decimal

Square Root

a number that when multiplied by itself equals a given number

Cube Root

a number that when multiplied three times equals a given number

Whole Number

a number without fractions; an integer, its opposites, and zero,

Perfect Cube

a rational number whose cube root is a whole number.

Perfect Square

a rational number whose square root is a whole number

Radical Sign

a symbol to indicate a root

Radicand

the number under the radical sign

Real Number System

the set of all rational and irrational numbers

Convert

to change from one form to another