mathematics Verified Precision Tool
Rounding Calculator
Round numbers to nearest integer, decimal place, significant figures, or nearest fraction.
Calculation Solution
Rounded = 100
Precision: 150 decimal places
Mathematical Formula
Rounded = Math.round(Number * 10^d) / 10^d
Overview & Explanation
Rounding replaces a numerical value with a simpler approximation with specified precision.
How It Works
- Look at the digit directly to the right of the target decimal place.
- If digit is 5 or greater, round up; if less than 5, round down.
Practical Applications
- Formatting currency values to 2 decimal places.
Worked Example: Round 3.14159 to 2 decimal places
Round to hundredths.
1
Inspect 3rd decimal digit (1)
1 < 5 so round down
= 3.14
Frequently Asked Questions
What is standard half-up rounding?
Half-up rounding rounds .5 and higher up to the next integer.
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