Rounding Calculator
Rounds a number to the decimal places you choose.
Result
- Rounded
- 3.14
How to use the rounding calculator
- Enter the number.
- Enter the decimal places.
- The results update as you type, or press Calculate.
- Read the rounded first, then the supporting figures below it.
Formula
Round half up.
Worked example
For example, with these inputs:
- Number: 3.1416
- Decimal places: 2
the calculator returns:
- Rounded: 3.14
Background
These calculations appear throughout the Singapore syllabus, from primary school percentages and fractions to secondary school algebra and geometry. Understanding the formula makes problem sums easier because you can recognise which quantity is missing.
Calculators are best used to check working rather than replace it, especially for exams where method marks count. Work the problem by hand first, then confirm with the calculator.
Frequently asked questions
How does the rounding calculator work?
It applies this formula: Round half up.
Can I use any units?
Yes, as long as every input uses the same unit. The answer will be in that unit (squared for areas, cubed for volumes).