It wasn't an issue for my teachers.
The first hand calculator I ever saw was when I was taking a quantitative analysis course five years after graduating from high school and some rich kid showed up with a machine the size of a book that he had paid a month's wages for that could add subtract multiply and divide to two more places than I could estimate on my ten inch log log slide rule.
Today I carry one whenever I want to do even the simplest math, because both me and my flip phone are too stupid to do even that.