Solution : While adding numbers of different number of digits, we have to be careful in putting the numbers one below the other.
All the digits of the units' place should come one below the other.
Similarly, all the digits of the tens' place should come one below the other.
And all the digits of the hundreds' place should come one below the other.
See the vertical presentation of the process given below.
See how the numbers 678, 97, 9 are placed one below the other in the above presentation.
In 678, 6 is in hundreds' place, 7 is in tens' place and 8 is in units' place.
In 97, 9 is in tens' place and 7 is in units' place.
In 9, 9 is in units' place.
All the digits of the units place have to come one below the other.
Thus, you find 8, 7 and 9 one below the other in the units' place in the above presentation.
Similarly, you find 7 and 9 one below the other in the tens' place in the above presentation.
You find only 6 in the hundreds' place.
First, the digits in the units' place are added ( 8 + 7 + 9) to get 24.
In this 24, 4 is placed in the units' place of the answer and 2 is placed under the digits in the tens' place.
Then, add the digits in the tens' place including the small 2 carried over from the units' place,(7 + 9 + 2 ) to get 18.
In this 18, 8 is placed in the tens' place of the answer and 1 is placed under the digits in the hundreds' place.
Then, add the digits in the hundreds' place including the small 1 carried over from the tens' place,(6 + 1 ) to get 7.
This 7 is placed in the hundreds' place of the answer.
Thus the answer is 784.
Learning/Teaching Math Can Be Fun : Addition Sums
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Exercise on Addition Sums
Do the following Addition Sums.
Perform the addition sums of the following numbers.
287, 135, 398
789, 63, 7
234, 97, 25
300, 102, 245
111, 8, 12
6, 7, 934
129, 257, 25
107, 11, 19
633, 155, 119
818, 10, 32
For Answers, see at the end of the page.
Progressive Learning of Math : Addition Sums
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