Hey guys!

I am looking for a math tool to practice calculation of percentages such as margins. The traditional mental math training tools from https://www.caseinterview.com/math/mathtest.php and preplounge only train to caclulate absolute numbers form percentage rate, but not percentages such as margins from absolute numbers. I am looking for calculations such as 25m/40m etc.

Does anyone know a tool or qa way to practice these calculations?

Best wishes!

Mark