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Partial Sums. An Addition Algorithm. 2 6 8. Add the hundreds ( 200 + 400). + 4 8 3. + 11. Add the partial sums (600 + 140 + 11). Partial Sums. 600. Add the tens (60 +80). 140. Add the ones (8 + 3). 751. 7 8 5. Add the hundreds ( 700 + 600). + 6 4 1. + 6.
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Partial Sums An Addition Algorithm Created by Rina Iati, South Western School District, Hanover, PA
268 Add the hundreds (200 + 400) + 483 + 11 Add the partial sums (600 + 140 + 11) Partial Sums 600 Add the tens (60 +80) 140 Add the ones (8 + 3) 751 Created by Rina Iati, South Western School District, Hanover, PA
785 Add the hundreds (700 + 600) + 641 + 6 Add the partial sums (1300 + 120 + 6) Let's try another one 1300 Add the tens (80 +40) 120 Add the ones (5 + 1) 1426 Created by Rina Iati, South Western School District, Hanover, PA
329 + 989 + 18 Do this one on your own Let's see if you're right. 1200 100 1318 Well Done! Created by Rina Iati, South Western School District, Hanover, PA
Partial Sums The partial sums algorithm for addition is particularly useful for adding multi-digit numbers. The partial sums are easier numbers to work with, and students feel empowered when they discover that, with practice, they can use this algorithm to add number mentally. Created by Rina Iati, South Western School District, Hanover, PA
