Sometimes, rather than rounding off to the nearest whole number, you might need to be a little more accurate. You might need to include some of the digits after the decimal point.

In these cases, we can round off the number up to a certain number of decimal places.

Do not confuse this with rounding off using significant figures, as this is slightly different!

**Remember**

The same rules for rounding up apply here:

**5 or more**, we '**round up**'.**4 or less**, it stays as it is.

- Question
Write 2.6470588 to 2 decimal places (dp).

- Answer
Did you get the answer

**2.65**? You needed to round up. We want 2 decimal places.*Look at the 2nd decimal digit.*The 2

^{nd}decimal digit is 4. So the number lies between 2.64 and 2.65*Look at the next digit.*The next digit is 7, so we have to round up. So the answer is

**2.65 (2 dp).**

- Question
On a calculator, work out , giving your answer correct to one decimal place.

- Answer
*On a calculator, work out*= 7.874007874...We need one decimal place. That means one number after the decimal point. The 1

^{st}number after the decimal point is 8.*This means the answer lies between 7.8 and 7.9*. The next digit is 7. This means we have to round up.So the answer is = 7.9 to 1 dp.

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