1. The problem statement, all variables and given/known data I am starting to confuse myself with the proper use of SF. I am to convert time from minutes to hours, keeping in mind proper SF 2. Relevant equations conversion factor: 1 min = 1/60 hr 3. The attempt at a solution The timing error is +/- 0.2 (1SF) = 0.003hr (1SF) 20.0 min (3 SF) = 0.333 hr (3 SF), but the conversion factor has 1 SF??? would my answer be 0.3 hr? I'm confused because now I have varying decimal places and when I say 0.3 +/- 0.003 hr doesn't seem corect at all because when adding or subtracting I would drop the 0.003 therefore never being relevant??? Please help.