The Chemistry Tutor: Learning by Example DVD Series provides an introduction to chemistry through step-by-step example problems. Emphasis is placed on giving students confidence in their skills by gradual repetition so that the skills learned are committed to long term memory. This episode covers significant figures in chemistry calculations, focusing on why the number of decimal places in the calculated answer to a problem should take into account how many decimals were provided in the provided statement. Grades 9-Adult. 48 minutes on DVD.