Partial Sums An Addition Algorithm
600 Add the  tens  (60 +80) 140 Add the  ones  (8 + 3) 751 Partial Sums 2 6 8 +  4 8 3 Add the  hundreds  ( 200 + 400) Add...
1300 Add the  tens  (80 +40) 120 Add the  ones  (5 + 1) 1426 Let's try another one 7 8 5 +  6 4 1 Add the  hundreds  ( 700...
1200 100 1318 Do this one on your own Let's see if you're right. Well Done! 3 2 9 +  9 8 9 +  18
<ul><li>The partial sums algorithm for addition is particularly useful for adding multi-digit numbers. The partial sums ar...
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Partial sums-addition-algorithm

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Partial sums-addition-algorithm

  1. 1. Partial Sums An Addition Algorithm
  2. 2. 600 Add the tens (60 +80) 140 Add the ones (8 + 3) 751 Partial Sums 2 6 8 + 4 8 3 Add the hundreds ( 200 + 400) Add the partial sums (600 + 140 + 11) + 11
  3. 3. 1300 Add the tens (80 +40) 120 Add the ones (5 + 1) 1426 Let's try another one 7 8 5 + 6 4 1 Add the hundreds ( 700 + 600) Add the partial sums (1300 + 120 + 6) + 6
  4. 4. 1200 100 1318 Do this one on your own Let's see if you're right. Well Done! 3 2 9 + 9 8 9 + 18
  5. 5. <ul><li>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. </li></ul>Partial Sums

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