 Okay, so now let's convert the next one, 12 gallons, to quarts. So remember, the first thing we do is write n equals 12 gallons. And we don't have to memorize the conversion factor, but we got it from the page before. It's 1 gallon equals 4 quarts. Okay, so remember, you want to give this to be quarts at the end. So in order to do that, you've got to cancel gallons out. So gallons has got to be at the bottom, and quarts is at the top. So we want this to be a conversion factor. So 4 quarts over 1 gallon, or 4 quarts equals 1 gallon. So all we do is 12 times 4, and you can use your calculator. But luckily enough, I can do that in my head. It's 48 quarts. And is that the right number of sig figs? Well, it's 2. So do we count these? No, because it's the conversion factor. We only use the number that's given to us in the problem. And that's got 2 sig figs, so that's got 2 sig figs. So we'll do one more today, or involved one, and then I'll let you guys go.