Very engaging lecturer, great sense of humor. Extremely timely with email repsonses. Grading was homework, 2 midterms, and a final. Holds a lot of office hours. Homework can be tough but he'll help you in OH. Midterms generally easier than homework. Also just a nice guy

HW 25%, 2 midterms 15% each, 1 final 45%; He's very funny and genuinely helps so much in office hours. Favorite math class at UCSB thus far and only class I ever went to that I waNTed to go to because the course content is fun (he makes it fun). Homework was light (5ish problems per week) and if they're hard, mathlab helps so much.

Very nice professor. Lectures were straightforward, exams were very reasonable difficulty. Very manageable class if you study effectively.

One of the best math professors I have ever had. Made all the material easily accessible and genuinely wanted students to succeed. Would absolutely recommend.

The best math professor ever. Lectures are interesting and he posted recordings for most topics from previous years. Grading on exams are super generous. Super helpful in office hours. Respond to emails very fast. Overall great class and great professor. By the way the TA Arthur is amazing too!

Kasteels doesn't make the assessments and content harder than it should be As long as you stay on top of the homework the course will be a breeze. He puts very simple questions on the exam and is very generous in giving partial credits even if you don't get the question right. Plus he's a sexy hot DILF. Who wouldn't want a daddy as their prof?

It seemed like he did not care much about the class and it was clear that he did not want to teach this lower division class. He spent little effort explaining the topic and had no curve at the end of the quarter.

Large class so Prof Casteels wasn't super attentive to individual students but that's what you get in a large lecture hall. HW every week, not too bad if you don't leave it till Sunday night. 2 midterms and a final; go to the lectures so you know what to study for. I failed AP Calc AB in HS over Covid and MATH 3A was far easier for me to learn.

Overall he's not that bad, but he doesn't really give you a whole lot of resources to learn about the topics besides the textbook which is pretty hard to learn from. The biggest issue with this class is the webworks homework. Its really specific on decimal places, and format etc. He also doesn't really define what you need to know very well.

Chill, somewhat funny dude...but makes concepts so much more complicated than they have to be. Learned this math in high school and it was a piece of cake. Casteels makes it so much more complicated by overexplaining.

You can learn a lot in professor Casteels' class, but he does not trick you in homework or exams. So you can learn a lot, and still get good grades.

Took this Spring 2022. Great prof! He won't surprise you on a test with anything you wouldn't be capable of doing, and he curves generously. HW is tough but going to office hours really helps clarify most of it. He responds to emails as well.