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Partial Sums

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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