There are other ways of expressing uncertainty besides significant figures. for example, suppose a quantity is known to have a value between 20.4 and 20.0 and our best estimate of the value is midrange at 20.2. we could write the number as 20.2 +/- 0.2 and say that the number has a 1% uncertainty. we would also say it has 3 significant figures. if we square a number with 1% uncertainty (i. e., 2 parts in about 200) and 3 significant figures, what results? 1 unlocks icon subscribe to course hero to unlock this document unlocks icon subscribe to course hero to unlock this document unlocks icon subscribe to course hero to unlock this document