Number rounding
Number rounding is the replacement of a numerical value with a nearby value at a specified precision according to defined directional or tie-breaking rules.
Math for Web Design
A rounding strategy specifies how a numerical value is selected when rounding it to an interval.
- How it is used
- Supports polished frontend layout, typography, currency, and progress displays by controlling calculated numeric output.
- How deep it goes
- Explains whole-number directions, negative and half-value behavior, CSS strategies, intervals, and practical display uses.
- Examples
- Uses column widths, font scaling, currency strings, progress percentages, negative values, and CSS interval declarations.
- What you can do after
- Apply it via JavaScript Math methods, toFixed(), and CSS round() to produce deliberate UI values.
Get Programming: Learn to code with Python
A Python built-in function that returns a number rounded to a specified precision or to the nearest whole-number value by default.
- How it is used
- Uses round() to turn decimal calculation results into practical whole-minute values.
- How deep it goes
- Explains the call through a worked conversion and floating-point rationale, but does not develop broader rounding rules.
- Examples
- Demonstrates round() while converting 123 minutes into 2 hours and 3 minutes.
- What you can do after
- Apply round() to correct small floating-point discrepancies when a calculation should produce a whole-number result.
Read how Get Programming: Learn to code with Python explains number rounding →
Learn Haskell by Example
round is a Haskell function that converts a fractional value to the nearest integral value according to its rounding rules.
- How it is used
- Converts fractional audio calculations into integer sample counts required by signal-processing code.
- How deep it goes
- Defines the RealFrac-to-Integral type relationship and demonstrates round in sample-count helpers and GHCi.
- Examples
- Uses audio sample-rate helpers and round (3.1415 :: Double) :: Integer as concrete examples.
- What you can do after
- Apply round to convert floating-point calculations into values with an Integral result type.
Read how Learn Haskell by Example explains number rounding →
Clojure: The Essential Reference
Numeric rounding is the approximation of a value to the finite precision available in its numerical representation.
- How it is used
- Controls numerical precision explicitly in BigDecimal calculations and floating-point-sensitive code.
- How deep it goes
- Defines precision, rounding modes, numeric contagion, exceptions, and financial examples without developing rounding internals.
- Examples
- Demonstrates 22/7, floating-point subtraction error, and share-price calculations with explicit rounding.
- What you can do after
- Apply it via with-precision to choose precision and rounding behavior for BigDecimal expressions.
Read how Clojure: The Essential Reference explains number rounding →
Related concepts
- integerproduces · An integer is a whole number with no fractional part, including negative numbers, zero, and positive numbers.
- RealFracuses · RealFrac is the Haskell type class for fractional real-number types that support conversion to integral values and decomposition into integral and fractional parts.
- floating-point arithmeticaddresses · Floating-point arithmetic is computation using finite-precision representations of real numbers, in which rounding and limited range can make results differ from exact real-number arithmetic.
- functionkind of · A function is a defined operation that maps inputs to outputs and, when implemented as a callable program unit, may also produce effects.
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