In addition of decimal fractions we will discuss here how to add two or more decimals.
Addition of decimal numbers are similar to addition of whole numbers. We convert them to like decimals and place the numbers vertically one below the other in such a way that the decimal point lies exactly on the vertical line. Add as usual as we learnt in the case of whole numbers.
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.
Answers: 1779.65
3. Add 143.21; 89.025;1001.002; 975.35
Here, all the decimal numbers are in like decimals.
143.210 + 89.025 + 1001.002 + 975.350
Now write the decimals in column and add as we add whole numbers.
Answers: 2208.587
4. Add: 7.035; 8005.007; 91.71; 15.9142
First convert all the decimals to be added into like decimals i.e. 7.035
into 7.0350, 8005.007 into 8005.0070, 91.71 into 91.7100 and 15.9142 will remain as it is.
7.0350 + 8005.0070 + 91.7100 + 15.9142
Now write the decimals in column and add as we add whole numbers.
Answers: 8119.6662
5. Add: 81.71; 198.001; 2071.1945; 9.09
Convert all the decimals to be added into like decimals i.e. 81.71 into 81.7100, 198.001 into 198.0010, 2071.1945 will remain as it is and 9.09 into 9.0900.
81.7100 + 198.0010 + 2071.1945 + 9.0900
Answers: 2359.9955
6. Add: 43.91; 108.431; 832.01
Convert all the decimals to be added into like decimals i.e. 81.71
into 81.7100, 198.001 into 198.0010, 2071.1945 will remain as it is and 9.09 into 9.0900.
43.910 + 108.431 + 832.010
Answers: 984.351
7. Add: 91.4; 31.83; 101
Convert all the decimals to be added into like decimals.
91.40 + 31.83 + 101.00
Answers: 224.23
8. Add: 79.03; 13; 55.05
Convert all the decimals to be added into like decimals.
79.03 + 13.00 + 55.05
Answers: 147.08
9. Add 19.405; 20.21 and 8.1
Solution:
Converting the given decimals into like decimals, we get 19.405; 20.210 and 8.100
Hence, 19.405 + 20.210 + 8.100 = 47.715
10. Add $15.25; $60.98 and $10.5
Solution:
Converting the given decimals into like decimals, we get $15.25; $60.98 and $10.50
Hence, 15.25 + 60.98 + 10.50 = $86.73
11. Complete the given magic square. The sum of all rows and column is 9.0.
Solution:
Sum of the first row = 4.8 + 0.6 + 3.6 = 9
Sum of the second row = 1.8 + 3.0 + 4.2 = 9
Sum of the third row = 2.4 + 5.4 + 1.2 = 9
Again,
Sum of the first column = 4.8 + 1.8 + 2.4 = 9
Sum of the second column = 0.6 + 3.0 + 5.4 = 9
Sum of the second column = 3.6 + 4.2 + 1.2 = 9
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