Sorry. i accidently clicked the answer button and didnt finish. so, the easiest way is to simply divide by two each time. Though tedious, there is a small chance of mistakes 180/2=90:90/2=45. at this point you have (2 and 2) as your factors. 45/5=9 : now our factors are 2 times 2 times 5. 9 is a square, so finally, our factors are 2 times 2 times 3 times 3 times 5.