Recently, I took a job working for a VR company in DTLA and while I expected the normal level of 3D games maths, I didn't expect this. My first task was to do page ranking based on GDelt data so I had to perform statistical analysis on multiple web pages and create an algorithm that would rank those pages. This required stats (average rank of 6 fields based on mean and first stddev) and simple algebra.

Then I was moved onto Tweet ranking. Tweets need to be ranked partially based on how many tweets... between 0 and 50 million. That sounded like a log to me. So, by using algebra, logs, and reverse Fibonacci, I came up with a nice ranking scheme that matches my GDelt ranking numbers.

Then I was moved onto another project involving a vehicle hanging on the edge of a cliff. Move items too far forward and the vehicle goes over. This involved basic physics, moments, and collision.

What I am saying is that there are real applications (games in this case) for all of the maths that you learn. Whenever you might wonder if "this is really worth it", let me simply say that yes, it really is.

EDIT: The basics for 3D maths are vector calc, matrix operations and fields, trig, and quaternions.