"Your maths skills are terrible"

Pupils had to:
1) Guess the final number, just the solution
2) Write the whole operation without working it out, putting all the brackets in the correct place.

1ºA ESO finished the work. Most of them did everything well, so their maths skills are not so terrible...
Let's see how they did it:

1º ESO B finished it too. They can be good on maths too... Let´s see