1. Partial Sums
An Addition Algorithm

2. Partial Sums Addition Algorithm
Partial Sum Addition involves
Thinking of the place value of the digits in the numbers,
Finding partial sums by adding parts of numbers according to their place value, and
Adding partial sums together to get a total

3. Partial Sums Addition
Solve Begin by thinking of the expanded notation for the numbers being added: 268 = =

4. + 483 600 140 + 11 Partial Sums 751 268 Add the hundreds (200 + 400)
Add the tens (60 +80)
140
Add the ones (8 + 3)
+ 11
Add the partial sums
( )
751

5. Let's try another one
785
+ 641
Add the hundreds ( )
1300
Add the tens (80 +40)
120
Add the ones (5 + 1)
Add the partial sums
( )
1426

6. + 989 1200 100 + 18 1318 Do this one on your own
329
+ 989
Let's see if you're right.
1200
100
+ 18
1318
Well Done!