Thank you very much for the information and ideas.

I talked to DS about math and different options.

This is what he wants:

No timed tests and extra time on assignments
Multiplication chart and sample problems at desk

"I just want to do the least amount of math possible throughout my life. I want to know whatever is required for being a normal adult with a phone. I like history, reading, writing, drama, and science. And I know science involves math but that's not the science I like. I don't like math, I'm not good at math and I don't want to spend a lot of my time doing it, either now or in the future."