have been thinking about this lately as i do practice problems to refresh my brain before i retake algebra/ trig this fall. i use printer/ unruled paper or get scrap paper from my local library to do my work on but i usually throw out every sheet when im done. im planning on taking math very seriously as i want to progress onto pre-calc next year, so should i be saving my work to look over it? is it a waste or would it be helpful in the long run?