STRANGE .. u must try it ...
This is a little test.
Just follow the instructions as quickly as possible.
Do not go to the next calculation before you have finished the previous one...
You do not ever need to write or remember the answers.
start:
15 + 6
3 + 56
89 + 2
12 + 53
75 + 26
25 + 52
63 + 32
I know!