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The Partial Sums method is a two-stage process.
Step-1: Add up the hundred place.
400 + 300 = 700

Step two: add the tens place.
80 + 60 = 140

Step-3: add up the ones place.
6 + 5 = 11

Step-4 add all the partial sums to
find answer. 700+140+11=851
3      6      6  
100s
Example:
4      8      5
+
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Partial-Sums Addition Algorithm
In the first stage one looks at each column (working
left to right
) and add up the place-values
represented by the digits in that column.
In the second stage those partial sums are added
together.
page 1 of 2
Add 4 8 5 + 3 6 6 using the partial sums method.
______________
7      0      0
1      1
1      4      0
______________
8      5      1
10s
1s
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Partial-Sums Addition Algorithm
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