Calculators are widely used in day to day life to do the calculations. The result given by a calculator has too many digits.

**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.

** **

Tags : Measurement | Chapter 1 | 8th Science , 8th Science : Chapter 1 : Measurement

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8th Science : Chapter 1 : Measurement : Rounding off | Measurement | Chapter 1 | 8th Science

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