Math > Year 3

Adding up to 3-digit numbers using Column method

In the Column method, the numbers to be added or subtracted are set out above one another in columns. 

Let’s learn about it with the help of an example -

Step 1 – Arrange the numbers above one another in columns.



Step 2 – Start adding numbers from the left side, i.e., ‘ones’ to the last column, i.e., ‘hundreds’.

6 ones + 5 ones = 11 ones


We can regroup 11 ones into 1 ten and 1 ones.

Can we change the order of numbers to be added?
In addition, the order of the numbers to be added doesn’t matter. The order would not change the answer.

For example, 5 + 2 = 7
If we change the order of the numbers to 2 + 5, we will still get 7 as the answer.


Let's try a question.

One mango tree has 127 mangoes. Another has 185 mangoes. How many mangoes are there altogether?


Number of mangoes on one Tree = 127
Number of mangoes on another tree = 185

Total number of mangoes = 127 + 185


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