I learnt this way of thinking about units in my engineering degree, and it is indeed incredibly powerful and I regularly use it. But I would classify it as "al

I learnt this way of thinking about units in my engineering degree, and it is indeed incredibly powerful and I regularly use it. But I would classify it as "algebra" instead of "arithmetic". Being fluent in manipulations like 60 km/h = 60 km/h * h/3600s * 1000m/km is not a trivial modality of thought to unlock!