ok say i have this problem 38/64 + 72/109 = 136/173 .. how do i simplify that? and one last question.. how do i find the percentage of something.. like say if joe has 42$ and the bank account has 535$ in it how much percent money does he have on him compared to whats in his bank account? whats the equation to figure that out? 42 x .535? i dont get it.. thanks