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   66 + 27   80  (60 + 20) Add the tens   13  (6 + 7)   Add the units   93 Vertical Addition by Partition with 3-digit Numbers   773 + 401  1100  (700 + 400) Add the hundreds    70  (70 + 0)  Add the tens     4  (3 + 1)    Add the units  1174

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