This activity is aimed at children who have mastered the standard written method of addition and are looking for a greater challenge.
The various tasks give lots of practice of the addition skill as well as developing thinking and problem-solving skills to quite a high level.
Just take your children as far as they want to go.
Important Note: Teacher or parent guidance for using these slides can be found in the speaker notes section, which can be found by clicking on the three dots which appear when you click or mouseover the bottom left of a slide.