Okay so the question involves finding the dimensions of a container of least cost given a specified volume and the cost of material on various surfaces. However it gets down to this one part where I have a number 2250. In my notes, my teacher automatically converts 2250 to (15^2)(10) as a simplification. My question is how does my teacher make this leap? There are no calculators allowed in this course so is there some method to this arithmetic madness or do you just have to be a human calculator?