Rounding to Decimal Places

Rounding to Decimal Places

GCSE(F)

Rounding numbers to decimal places involves counting the required number of decimal places after the decimal point; then checking the next decimal place to determine whether any rounding is required.

For example, giving 0.54603 to two decimal places would initially be 0.54: the following (third) decimal place is a 6, so the number is rounded up to 0.55.

Examples of rounding to decimal places:

Examples

1. An experiment in a physics lab has shown that the force required to move an object was 2.466 Newtons. What is this force measured to 1 decimal place (1 dp)?

2. Charlie bought a book for £10. It had frac(1)(3) off because it was in a sale. How much did Charlie pay?
The purchase price is 10 x frac(2)(3) = 6.66666 recurring, or 6.dot6. Round to 2 decimal places (for pence) gives 6.67. The implication to round to 2 decimal places is given by the use of pounds and pence.