Rounding: Your Questions Answered
These are the questions people ask most often about rounding. Each answer is short; follow the links for the full detail.
What does a rounding calculation tell me?
Rounds a number to the decimal places you choose.
What is the formula?
Round half up.
What do I need to enter?
Number, Decimal places.
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).
Can you show an example?
For example, with these inputs:
- Number: 3.1416
- Decimal places: 2
the calculator returns:
- Rounded: 3.14
Any tips?
- Estimate the answer roughly first so you can spot a result that is clearly wrong.
- For exam work, show your method; marks are often given for working, not just the answer.
- Use brackets to make the order of operations explicit.
Background
Rounding is a common source of small errors. Keep full precision during intermediate steps and round only the final answer to the number of decimal places or significant figures the question asks for.
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.
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.
Related calculations
- What Percent Is X of Y: Finds what percentage one number is of another.
- Percentage Change Calculator: Calculates the percentage increase or decrease.
- Percentage Increase Calculator: Adds a percentage to a number.
- Percentage Decrease Calculator: Subtracts a percentage from a number.
Try it yourself with the Rounding Calculator.
Run your own numbers: Rounding Calculator