Partial Sum Algorithm

Latest update to this document: 27 February 2003

In the Partial Sum algorithm the numbers in the one's digit column, the right column, are added together.
Then the numbers in the ten's digit column, the left column, are added together.
The two sums are then added together.

+ 1 0
1 5
1 0
+ 2 0
3 0

In the one's digit column add up to 10, the number is the tens digit column add up to 20.
The sum of the numbers equals 30.

Now that you have seen you have seen how to add numbers using the partial sum algorithm.
Go on to the next algorithm, go back to the balloon problem or practice the partial sum algorithm by clicking on the names of the options listed below.

Back to the balloon problem Traditional Algorithm Left to Right Algorithm Scratch Addition

Now Practice Your Skills!

Practice The Partial Sum Algorithm


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