Addition is supported using base 10 material and a place value grid. 

Addends are up to 3 digits each in Year 3.

Addition is supported using place value counters and a place value grid. During Year 4, both the expanded and compact methods of addition are used, with the aim being children are using compact formal addition by the end of the year. Addends are up to 4 digits each in Year 4.

In Upper School, the focus is on efficient written methods. Calculations involve much bigger numbers, and compact formal methods are the most efficient way to solve these calculations.

Place value counters and grids are still used to support where needed.