math 156
posted by kim .
name five problem solving strategies that are frequently used?

This site lists more than five problem solving strategies.
http://library.thinkquest.org/4471/learn.htm 
It depends upon the problem. Please be more specific. Some problems just involve computing a number with an available formula. In other cases you have to derive the solution formula. In other cases you might have to make an approximation by neglecting unimportant variables. Sometimes you have to find an optimum value.