This document discusses multiplying and dividing by 10 and 100. It explains that when multiplying by 10, a 0 is added to the end of the number, and when multiplying by 100, two 0s are added. For division, it states that when dividing by 10 the last 0 is removed, and when dividing by 100 the last two 0s are removed. Examples are provided to demonstrate these rules.