By the end of year 5 children should be confident with written methods of addition. This worksheet is a stage in this process. Some of the questions are set out how they should be. The later questions need to be set out in the same way. It is important to make sure that units are lined up with units, tens with tens etc and squared paper can be a help with this.
Remind children that when adding three digits that they can be added in any order: look for pairs that make 10 or other combinations that they recognise instantly.
This page can be found in the year 5 Calculations section. Similar resources can also be found in the Four Rules section.