The kids LOVED this problem solving activity!
Plenty to keep the kids busy here. This lesson is aimed at early KS2 but could be adapted and used in year 2 - year 6 with ease. Depends no the ability of your children and which school you teach in.
The main objective from this lesson was to learn effective ways to add several numbers. I.e. looking for number bonds etc.
But there is also a problem solving element to the lesson as the children need to use a systematic approach to solve the problem at hand.