159083

David and I have figured out a solution to the question 4 dominoes.
What we used:
We used trial and error we also used addition and chance
How we figured it out:
We worked out the equations by arranging the dominoes and eventually getting the answer of 12 on each side of the square.
Sadly we can't upload the picture but it looked like this
on the left we had 4 3 and 5 on the right 2 4 and 6 on the top 4 6 and 2 and on the bottom 5 1 and 6