Page 1 - LN 6

Subject – Mathematics

Chapter 6 – DECIMALS

Sub-topic 5 : ADDITION AND SUBTRACTION OF DECIMALS

In addition of decimal fractions we will discuss here how to add two or more decimals.

The rules of adding decimal numbers are:

(i) Write the digits of the given numbers one below the other such that all the decimal points are in the
same vertical line.

(ii) Add as we add whole numbers.

(iii) Put the decimal point of the sum vertically below the other decimal points.

Let us consider some of the following examples on addition of decimal numbers.

1. Add 14.02, 198.3, 394.051.

First convert all the decimals to be added into like decimals i.e. 14.02 into 14.020, 198.3 into 198.300
and 394.051 will remain same.

14.020 + 198.300 + 394.051

Now write the decimals in column in such a way that the decimal points of all the decimals are in the
same column and then add the decimal ignoring the decimal point.

Atlast, put the decimal point in the sum directly under the decimal points of all the decimals.

Answers: 606.371

2. Add $ 205.40, $ 80.75 and $ 1493.50.

Here, all the decimal numbers are in like decimals.

$ 205.40 + $ 80.75 + $ 1493.50

Now write the decimals in column in such a way that the decimal points of all the decimals are in the
same column and then add the decimal ignoring the decimal point.