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   62 + 83  140  (60 + 80) Add the tens    5  (2 + 3)   Add the units  145 Vertical Addition by Partition with 3-digit Numbers   984 + 921  1800  (900 + 900) Add the hundreds   100  (80 + 20)  Add the tens     5  (4 + 1)    Add the units  1905

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