POSITIVE: Well, I suppose you'll actually use math relatively more often in life (compared to science) Also, in math, if you get a question correct, it will always be correct, unlike English or other languages, if the teacher thinks your writing isn't good, she can give you a bad grade. In English, the grades you get are often subject to the teacher's moods/ opinions of you as a student. NEGATIVE: Well, it gets boring.
There are quite a few websites that have factor lists. Also, if you can find the biggest number that goes into it, then all of the factors of that number go into it as well.