Partial Sums An Addition Algorithm.

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Presentation transcript:

Partial Sums An Addition Algorithm

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

Partial Sums Addition Solve 268 + 483 Begin by thinking of the expanded notation for the numbers being added: 268 = 200 + 60 + 8 483 = 400 + 80 + 3

+ 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 (600 + 140 + 11) 751

Let's try another one 785 + 641 Add the hundreds (700 + 600) 1300 Add the tens (80 +40) 120 Add the ones (5 + 1) + 6 Add the partial sums (1300 + 120 + 6) 1426

+ 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!