Math numbers
imaginary numbers
a complex number that can be written as a real number multiplied by the imaginary unit i, which is defined by its property i2 = −1. The square of an imaginary number bi is −b2. For example, 5i is an imaginary number, and its square is −25. Zero is considered to be both real and imaginary.
irrational numbers
a number that cannot be expressed as a fraction for any integers and . Irrational numbers have decimal expansions that neither terminate nor become periodic. ... Numbers of the form are irrational unless is the the power of an integer. Example: π (Pi) is a famous irrational number. We cannot write down a simple fraction that equals Pi. The popular approximation of 22/7 = 3.1428571428571... is close but not accurate. Another clue is that the decimal goes on forever without repeating.
whole numbers
a number without fractions; an integer. Examples: 0, 27, 398, 2345
integers
a whole number; a number that is not a fraction. a number that can be written without a fractional component. For example, 21, 4, 0, and −2048 are integers, while 9.75, 5 ¹⁄₂, and √2 are not. Examples of integers are: -5, 1, 5, 8, 97, and 3,043. Examples of numbers that are not integers are: -1.43, 1 3/4, 3.14, .09, and 5,643.1.
rational numbers
any number that can be expressed as the quotient or fraction p/q of two integers, a numerator p and a non-zero denominator q. Since q may be equal to 1, every integer is a rational number. Number As a Fraction Rational? 5 5/1 Yes 1.75 7/4 Yes .001 1/1000 Yes −0.1 −1/10 Yes
