Multiple choice calculator

Hi i would like to create a calculator that let you choose numbers out of a selection and then multiply them.

The selection should be visualized changing the icon (no selection = all icons white / selected swap the icon with the right one which are colored).
I tried putting all elements of one selection in one class but i don´t get it working.

Thanks for any help!
selection-calculator.hype.zip (356.1 KB)

includes a calculator:

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