 Let's do this problem now, so it says, if you have a length of 52 yards, how many feet would it be? So notice, feet and yards are not metric units, okay? They're both English terms, so I have to give you that conversion fact. Okay, I don't expect you to memorize them. So notice the length was given in yards here, so we want to convert it to feet, right? That's what a question asks. So how do we do that? But we have to cancel out the units of yards and get the units of feet out of it, okay? So this conversion factor can be written like this, or it can be written like this, okay? Or it can be written like this, okay? Because this equals this, right? This would be like 2 equals 2. Is everybody okay with that? 2 equals 2? If I took 2 divided by 2, what number would I get? 1. If I multiply 1 by any other number, what number do I get from that number? What the number was before, right? Exactly, okay? So since this equals 1, right? I can use any of these conversion factors to change my units. That's what we're getting at here, okay? So let's do that. So yards is in the numerator here, so what? We want to cancel that out and get feet, so we want yards to be in the denominator for what we're multiplying. So which one of these two conversion factors has yards in the denominator left or right? Left, right? So let's just erase this one. Take this, multiply by, like that, and what do I do? Okay, something's in the numerator and that same thing's in the denominator. They cancel out, right? So I get 52, and then I want to divide that by 0.33, and what, how did you guys do? Very good, guys. So when I do something, I expect you guys to have your calculator out doing it, too. Okay, so that may need feet. So notice what I did here, 1.6 times 10 to the 2. This is called scientific notation. The reason I put only two digits here is because my starting number only had two significant digits, so I couldn't put the answer 157 on here, or 158, because I could only go to the right amount of digits on my starting material. Okay, any questions on that? Okay, very good.