Are there any colours that are commonly associated with basic arithmetical operations?
I want to make the operators +, −, ÷ and × more easily distinguishable by colourizing them. For the plus and minus operators the solution is probably using green and red. But what about division and multiplication operators?
I thought there might be some standard for pocket calculators. I found a few with a blue and a few with a green plus key, but didn't see a consistent pattern. Are there even any colours that can be associated with those operations or doesn't it matter what I choose?
Update: The question raised while testing a logic/math puzzle game prototype, where there are tokens containing those operators. They are a central part of the game and there are only a few numbers. I'm convinced colours will be very helpful to spot the operators better. I think of either colouring the background or colouring the operators themselves - maybe mixed, a consistent background colour for all operators, another one for all numbers). Size has to be consistent. Due their button like nature (squares for now) they reminded me of a calculator, so that's where I started.