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maybe. You also need a knowledge / interest in science.
No you do not, all your doing is taking off one part, and replacing it with another, their is no math involved. People who tell you that u need to know math to become a mechanic, only say that because they have been told that by an adult.
Many people have trouble with math. They might have trouble because when they were little they didn't pay any attention in math or listen to what the teacher is saying/said. Maybe because they just don't like math. But you know your going to need math when you get older and even when young! So if your having trouble with math you should pay more attention and listen more to what the teacher is saying. She/He is not just telling you this because they have to teach it to you but your going to need to know this stuff when you get older. People use math today for buying things and measuring things and lots of other stuff!
You need to do the math to get the answers.
craft people, merchants, smiths,etc.,