real numbers
The number line
Real numbers include all numbers that can be placed on a continuous number line—integers, fractions, and irrational numbers like π and √2.
The term distinguishes them from imaginary numbers, which involve the square root of negative one.
In everyday math, nearly every number you encounter is real: The solution must be a real number, not imaginary.
Circle's fundamental ratio
- eFifth alphabetic character
- phiTwenty-first Greek letter
- zeroNumerical absence of quantity
- oneLowest positive integer
infinity · golden ratio · Avogadro · Planck
Numbers without fractional components
- rationalsNumbers expressible as quotients
- irrationalsNon-fractional real numbers
- transcendentalsIrrational beyond algebra's reach
- natural numbersPositive whole integers
whole numbers · decimals · fractions · interval · subset · countable · uncountable · density
Uninterrupted progression or coherence
- limitMaximum allowed extent
- convergenceProcess of approaching sameness
- divergenceSeparation from common origin
- sequenceOrdered succession of elements
series · calculus · derivative · integral · function · domain · range · bound
Tenths-based notation
- fractionPart divided by whole
- scientific notationNumbers times ten-powers
- significant figuresDigits indicating measurement precision
- roundingAdjusting to simpler values
approximation · precision · floating-point · mantissa · exponent · radical · square root · logarithm
pi
Circle's fundamental ratio
one · infinity · golden ratio · Avogadro · Planck
integers
Numbers without fractional components
- rationalsNumbers expressible as quotients
- irrationalsNon-fractional real numbers
- transcendentalsIrrational beyond algebra's reach
natural numbers · whole numbers · decimals · fractions · interval · subset · countable · uncountable · density · completeness
continuity
Uninterrupted progression or coherence
- limitMaximum allowed extent
- convergenceProcess of approaching sameness
- divergenceSeparation from common origin
sequence · series · calculus · derivative · integral · function · domain · range · bound · monotonic
decimal
Tenths-based notation
- fractionPart divided by whole
- scientific notationNumbers times ten-powers
- significant figuresDigits indicating measurement precision
rounding · approximation · precision · floating-point · mantissa · exponent · radical · square root · logarithm
- precalculusfunctions, polynomials, trigonometry, logarithms, exponential functions
- mathematicsalgebra, arithmetic, calculus, geometry, addition
- math conceptsangle, numbers, algebra, circle, equations
- math termsnumbers, plus or minus, linear growth, square, operand
- number linestick marks, origin, integers, points, arrows
- number typesprime numbers, natural numbers, whole numbers, integers, rational numbers
real numbersimaginary numbers
Multiples of i
complex numbers · complex plane · transfinite numbers · infinitesimals · cardinal numbers
real numbersintegers
Numbers without fractional components
natural numbers · whole numbers · rational numbers · counting numbers
real, number, realize, reality, unreal, realistic, realization, surreal, realistically