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irrational number
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Irrational Number
Number that cannot be expressed as an exact fraction. Irrational numbers include some square roots (for example, √2, √3, and √5 are irrational); numbers such as π (for circles), which is approximately equal to the decimal 3.14159; and e (the base of natural logarithms, approximately 2.71828). If an irrational number is expressed as a decimal it would go on for ever without repeating. An irrational number multiplied by itself gives a rational number.
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addition
common factor
cube (mathematics)
cube root
division (mathematics)
exponent
factor (number)
index notation
integer
irrational number
multiple
multiplication
negative number
number (mathematics)
number line
pi
place value
power (mathematics)
prime factor
prime number
reciprocal
root (inverse of power)
rounding
square
square root
standard form
subtraction
surd
common factor
cube (mathematics)
cube root
division (mathematics)
exponent
factor (number)
index notation
integer
irrational number
multiple
multiplication
negative number
number (mathematics)
number line
pi
place value
power (mathematics)
prime factor
prime number
reciprocal
root (inverse of power)
rounding
square
square root
standard form
subtraction
surd
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