Please study Addition Sums.
if you have not already done so.
There, we covered the process of adding three
digit numbers with examples and exercise.
There, we restricted ourselves to addition
of three digit numbers such that the
resulting number is also three digit number.
That knowledge is a prerequisite here.
Here, we deal with four digit numbers.
We have already seen in decimal number system
that the successor to 999 is 1000. i.e. 999 + 1 = 1000.
Let us present this addition in the
vertical presentation by using the
carry over method explained in two digit addition.
999
1
11
----
1000
----
Here, in the units' place,
9 and 1 added gave 10.
0 is put in the units' place of the answer,
below and 1 is carried over to the
tens' place. (see the small 1 present
below the digits in the tens' place.)
Now the 9 and the small 1 added gave 10.
0 is put in the tens' place of the answer
and 1 is carried over to the hundreds' place.
(see the small 1 present under the digits
in the hundreds' place.)
Now the 9 and the small 1 added
gave 10 which is directly put in
the answer, to get 1000.
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Perform the addition of the numbers 1987, 865, 94, 7
Solution to Example 2 of Addition Problems :
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.
All the digits of the hundreds' place should come one below the other.
And all the digits of the thousands' place should come one below the other.
See the vertical presentation of the process given below.
1987
865
94
7
221
----
2953
----
See how the numbers 1987, 865, 94, 7 are placed one below the other, in the above presentation.
In 1987, 1 is in thousands' place, 9 is in hundreds' place, 8 is in tens' place and 7 is in units' place.
In 865, 8 is in thousands' place, 6 is in tens' place and 5 is in units' place.
In 94, 9 is in tens' place and 4 is in units' place.
In 7, 7 is in units' place.
All the digits of the units place have to come one below the other.
Thus, you find 7, 5, 4 and 7 one below the other in the units' place in the above presentation.
Similarly, you find 8, 6 and 9 one below the other in the tens' place in the above presentation.
You find 9 and 8 in the hundreds' place.
You find only 1 in the thousands' place.
First, the digits in the units' place are added ( 7 + 5 + 4 + 7) to get 23.
In this 23, 3 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, (8 + 6 + 9 + 2 ) to get 25.
In this 25, 5 is placed in the tens' place of the answer and 2 is placed under the digits in the hundreds' place.
Then, add the digits in the hundreds' place including the small 2 carried over from the tens' place,(9 + 8 + 2 ) to get 19.
In this 19, 9 is placed in the hundreds' place of the answer and 1 is placed under the digits in the thousands' place.
Then, add the digits in the thousands' place including the small 1 carried over from the hundreds' place,(1 + 1) to get 2.
This 2 is placed in the thousands' place of the answer.
Thus, the answer is 2953.
Learning/Teaching Math Can Be Fun : Addition Problems
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Exercise on Addition Problems
Do the following Addition Problems :
Perform the additions of
the following numbers.
2785, 4987, 1200
7089, 613, 79, 4
2314, 907, 2500
6300, 1102, 1245
1101, 18, 12
6, 7, 1934, 607
1296, 2507, 254
1107, 101, 199
6733, 1055, 1019
8918, 100, 329
For Answers, see at the end of the page.
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