Slide 2:
Created by Rina Iati, South Western School District, Hanover, PA 2 6 8 + 4 8 3 600 Add the hundreds ( 200 + 400) Add the tens (60 +80) 140 Add the ones (8 + 3) Add the partial sums (600 + 140 + 11) + 11 751 Partial Sums
Slide 3:
Created by Rina Iati, South Western School District, Hanover, PA 7 8 5 + 6 4 1 1300 Add the hundreds ( 700 + 600) Add the tens (80 +40) 120 Add the ones (5 + 1) Add the partial sums (1300 + 120 + 6) + 6 1426 Let's try another one
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Created by Rina Iati, South Western School District, Hanover, PA 3 2 9 + 9 8 9 1200 100 + 18 1318 Do this one on your own Let's see if you're right. Well Done!
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Created by Rina Iati, South Western School District, Hanover, PA 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. Partial Sums