Rounding Decimals Calculator

Rounding number calculator is calculator tool which rounds off the decimal number. We can round off any decimal numbers up to specified number of digits.

Rules for rounding a decimal number:

Decide number of digits up to which we have to round off decimal number. Look at the number to the right of this digit.
It this is less than 5 then keep the previous number unchanged.
If this number is greater than or equal 5 then add 1 to the previous number.

Example 1: round 4005.9009 number up to 3 decimal places.

Solution: we have to round off this number up to 3 decimal places. Hence look at the number to the right of third digit after

decimal point. It is 9. Since 9 is greater than 5 we have to increase third digit by 1.

Third digit after decimal point is 0. Increasing by 1 it becomes 1.hence we replace third digit 0 by 1 and trim the digits after this

0.

Hence number becomes: 4005.901

Example 2: round 23.781 up to two decimal places.

Solution: we have to round off this number up to 2 decimal places. Hence look at the number to the right of second digit after

decimal point. It is 1. Since 1 is less than 5 we keep second digit after decimal point unchanged.

Second digit after decimal point is 8 remains same and trim the all the digits after this 8.

Hence number becomes: 23.78

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