You are looking at a thermometer that has a mark for each degree. You are going to write down a number corresponding to the temperature. How will you decide how many significant figures to use in the number? (i.e. Will you report the temperature to the ones place, tenths, hundredths other?) You are looking at a thermometer that has a mark for each degree. You are going to write down a number corresponding to the temperature. How will you decide how many significant figures to use in the number? (i.e. Will you report the temperature to the ones place, tenths, hundredths other?)