Mathematics

I'm helping Bas with his mathematics. He has a test (exam) tomorrow.
I must confess my maths knowlegde is a bit rusty, but together we managed to solve the 'diagnostic test'.
I corrected Bas several times, and he corrected me as well. I'm a bit too quick sometimes. Oops.
But by doing that Bas is learning a lot, and that's the goal after all.
Good luck tomorrow Bas!! Fingers crossed!