Rounding off

Rounding off

Calculators are widely used in day to day life to do the calculations. The result given by a calculator has too many digits. Hence, the result containing more digits should be rounded off. The technique of rounding off is used in many areas of physics.

Rules for rounding off

* Decide which is the last digit to keep.

* Leave it the same, if the next digit is less than 5.

* Increase it by one, if the next digit is 5 or greater than 5.

Problem 4

Round off the number 1. 864 to two decimal places.

Solution

We need to round off the number to two decimal places. So, the last digit to be kept is 6. Since the next digit is less than 5, we can retain 6 as it is. So the answer is 1. 86.

Problem 5

Round off the number 1. 868 to two decimal places.

Solution

We need to round off the number to two decimal places. So, the last digit to be kept is 6. Since the next digit is more than 5, we should increase the second digit by one. So, the answer is 1. 87.