 Okay, let's try this one together. It says calculate the volume in milliliters for this one kilogram of Solid silicon, okay, and it then it gives you the density of silicon, okay So you need to know a couple of conversion factors So we have grams here and kilograms here, so we're going to need to know the conversion factor between grams and kilograms So how many grams are there in one kilogram? A thousand? A thousand. So let's write that down first. Okay, so 1000 grams equals 1 Kilogram like that So there's another conversion factor that you need to know because it wants it in milliliters as opposed to cubic centimeters So you're going to have to learn how to convert those two, okay That one's an easy one to remember because one milliliter equals one cubic Okay So now we're going to have to use that information and these two things to figure out Well, what's the volume of silicon that we have? Okay? So the volume of silicon is going to be 1.00 kilograms And remember we don't want it in kilograms. We want it in grams So we're going to put kilograms down here using my conversion factor there. Okay, so what do we put? one kilogram What do we put up here? Thousand grams Kilograms cancels. Okay, so now we're in grams. So now we can use this conversion factor Okay, because remember cubic centimeters. That's a volume unit, too Okay, but we don't want it in cubic centimeters. We want it in milliliters. Okay, so now we're going to multiply by Well, if we want the volume in cubic centimeters, and we want to get rid of grams. Well, what are we going to put down here? Grams, okay, so that's going to be 2.33 grams per one cubic centimeter like that So now we have grams cancelled out, right? So probably pretty obvious now what we do, right? Just multiply this What do we put down here? And at the top Very good Cubic centimeters cancelled and now all we have to do is use our calculator Mind if I, the one thing I forgot to bring in here was Okay, so one One times a thousand, of course is going to be a thousand Times one is still going to be a thousand times one is going to be a thousand And then you're just going to divide a thousand by two point three three And you get and you want it to three significant figures remember. Okay, so in this case, it's going to be four hundred and twenty-nine So that's the volume of yours Okay, are you cool with doing that? Okay, so try the other one on your own and see if you can do that one and I'm sure you'll be able to Any questions?