As a current working A&P/IA and former Part 147 A&P instructor I can assure you if you passed high school math you have the basic knowledge to pass the A&P math requirement. A&P mechanics use fractions, domiciles, and some basic algebra. Of course everyday we use adding and subtraction to calculate weight and balance changes and tolerances between parts.
The practical test standards are published on the FAA web site at: http://www.faa.gov/education_research/t ... questions/
This will tell you at what level you will be tested in each subject area. Math is used in hydraulics, physics, sheet metal, weight and balance, and electrical wiring requirements.
Many A&P schools will teach you or refresh you math skills during the training so its no big deal. When I went to school we used slide rules and now with the new push button electronic calculators that pilots use it makes it easy for us as well. Now if we could teach pilots which buttons to push.
Pilots often laugh at the mechanic, but they do depend on us to make sure the weight and balance reports are correct in every aircraft. Yes, its true if it were not for us A&P mechanics pilots wouldn’t have anything to break.
On my private web site I have lots of information of A&P mechanic under Mechanic Tool Box.