Addition by Partitioning

Worked Examples of Addition by Partitioning

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In Years 3/4 children start to lay out numbers to be added vertically, to get ready for the introduction of column addition typically in Years 5/6.
When two-digit numbers are to be added, children are usually taught to add the tens first which gives a rough answer, and then add the units and add those to the total of the tens.
For three-digit numbers, the hundreds are added first, then the tens, and then the units.

Vertical Addition by Partition with 2-digit Numbers   22 + 67   80  (20 + 60) Add the tens    9  (2 + 7)   Add the units   89 Vertical Addition by Partition with 3-digit Numbers   236 + 188   300  (200 + 100) Add the hundreds   110  (30 + 80)  Add the tens    14  (6 + 8)    Add the units   424

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