Rounding and truncating decimal numbers

Rounding decimal numbers

Example

Round to tenth, to hundredth and to thousandth the following decimal number: 2,3851

To tenth →2,4

To hundredth →2,39

To thousandth →2,385

So, when rounding off, for example, to tenth, we write only one decimal. If the following decimal is bigger than 0,05 we round it up (as in the previous case), otherwise we round it down. That is, 2,38 would be 2,4, while 2,34 would be 2,3.

Truncating decimal numbers

Example

Truncate to tenth, to hundredth and to thousandth the following number: 2,3851

To tenth →2,3

To hundredth →2,38

To thousandth →2,385

As we can see, to truncate to tenth it is enough to write the number with a decimal digit, to truncate to hundredth with two decimal digits and so on.