[jambutty]

Compared to the old Imperial system of weights, measures and money, decimal is an absolute doddle.

When you got used to Logarithms they were easy but sadly inaccurate. As was the ordinary slide rule. There were large (and very expensive) scientific slide rules but even they were not absolutely accurate.

People are different and some have a flair for one subject whilst struggling in others but all have a grasp of simple arithmetic or they would have but for the teaching methods.