Description: Sal uses ratio reasoning to convert measurement units. One way to think about it is the ratio of hours for every week is 168 to one, and then they calculate, well if we have 1,176 hours, how many weeks is that going to be? So, let's see, that looks like we might be multiplying by seven. So we multiplied by seven, we multiplied the number of hours by seven, so that means we're gonna have seven times as many weeks.*Teacher Advisor is 100% free.