Introduction:
I introduce the lesson by telling the pupils about something that happened to me this morning, “When I went to school this morning I first saw three cat, and after a while I saw five more cats. How many cats did I see on my way to school?”

Main part:
I take the scales and show the pupils that I hang one weight on number 3 and one weight on number 5. They make suggestions about how many cats I have seen and I hang up the weight on the number they suggest on the other side of the scales. The scales should balance when their answer is right.
I write the addition on the whiteboard in numbers.

Round up:
The pupils will come forward and tell their own stories and do as I did. They will let their friends guess and finally they write the addition on the whiteboard. They can also make pictures about their stories.

Observations:
It is very important to observe that all the pupils understand the importance of equality and what this implies on the scales.