Mental Calculation for schoolgirls and schoolboys

A web app made with p5js for my college students who are learning the addition and subtraction of relative numbers.
the instructions are in French. I’m trying to translate them here :

“click on the two numbers that gives the proposed result using the displayed operation. Five minutes to make the greatest score”

two level and three type of question (addition, substraction and the two mixed)

http://www.coffeegame.fr/allisrelative/index.html

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