When I was in high school I thought book this was so much fun

http://182.160.97.198:8080/xmlui/bitstream/handle/123456789/...

which is all about the kind of numerical analysis you would do by hand and introduces a lot of really cool math like the calculus of differences

https://en.wikipedia.org/wiki/Finite_difference

i've been missing this knowledge! thank you for the recommendation.