You will need to be proficient in basic GCSE level math.
Ratios, trigonometry, division and multiplication (typically by 60), and basic speed/distance/time calculations, unit conversions.
You should be able to roughly answer such questions mentally too, as the Mental Maths KSA should contain these.
Take a look at EASA’s learning objectives and look for the math-related points, typically under the subjects General Navigation, Flight Planning, Principles of Flight.