Adding:
balance up to 2;
balance up to 3;
balance up to 4
would allow to explain right from the beginning he meaning of the = sign when writing an addition and its solution.
The equal sign = is much to often seen as a “do something signal”.
(see explanation here https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwjg7PHuws3sAhWIGBQKHZE3AIEQFjAAegQIBRAC&url=https%3A%2F%2Fgpc-maths.org%2Fdata%2Fdocuments%2Fdoks%2Fbehr-howequal.pdf&usg=AOvVaw1p8qTn7srhe2TxkTPM0zRx)
This perception will overflow the one of equality and block them.
If we introduce the usage of = sign with a balance activity the = sign will be build with the equality meaning.
The advantage of using GCompris here is that it is often difficult to have enough scales in a class, as it is easier to have 3 or 4 pc or tablets.