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I don't use much math per se, I almost never have the need to calculate anything by hand. But, learning math taught me the very important, and constantly needed skill of abstraction thinking and how to use symbols to represent just about anything.
This skill has, among other things, paved the way for learning programming, a skill used in my daily job.
If you're a publisher, deeply consider this trilogy!
Grim, disturbing, well-written.
...and if you happen to read Scandinavian, and haven't read this series yet: do so!