 So let's try this one. It says convert 5.5 inches to milliliters. So remember whenever we do these I have to give you the English Dometric or metric to English conversion because there's so many you can't memorize So what we're going to do in this case since it's an English Dometric we have to give you that 20 equals 2.54 That's not something that you're expected to memorize. Okay, so let's convert now So the link that was given was 5.5 Inches right and it wants us to give it and Milliliters so we've got this conversion factor here, but that's the centimeters not to milliliters So we're going to have to figure out the conversion factor from centimeters to millimeters Which is a metric to metric which it won't be so that's something you'll be expected to know Okay, but once you work on it for a second. It's not back. You just have to remember all the prefixes Okay, so let's go about doing this. So First thing we've got to do is get rid of those inches of course, and we've got a way to do that One inch on the bottom 2.5 centimeters on the top that cancels with that, right? But now we need to figure out something that goes from centimeters To millimeters so the thing is is I know the conversion factor One centimeter equals 10 millimeters So if you're if you can't do it that way if you can't remember centimeters to millimeters you do remember one meter equals 1,000 Millimeters Okay, and you also know one meter equals 100 centimeters Okay, so we'll do this problem again using those conversion factors in the same recording, okay? So when we do that of course now, let's get our trust the calculators 5.5 times 2.5 4 times 10 I got 139.7 Millimeters, but remember we've got to have the right number of significant figures, okay? So this has two significant figures, so so why am I using only the 5.5? Because 5.5 is the only number that was given in the problem, okay? If there was another number given a problem then you could use that number too Conversion factors you don't use their significant figures, okay? So anyways, this has two significant figures, right? That thing has more than two significant figures, so we're gonna have to do something to it, okay? So we've round so it's going to be we can do it a number of ways. Let's just do it this way 140 millimeters, okay? That's two significant figures because that trailing zero is insignificant if there's no decimal point in the answer Yeah, if I did this That'd be three significant figures, yeah, because there's now a decimal point Or I could say 1.4 times 10 to the 2, you know, if I wanted, okay? Let's do it the other way we were talking about with the other those conversions that you probably already know, you know the one meter is 1000 Millimeters and so on So 5.5 inches, so this is the same problem. We're just doing it with a couple more steps 2.54 centimeters one inch Time so instead of doing this we're going to use those two So we want to cancel out centimeters, right? So down here And you guys can always help me like this. So what do we have now? So we've cancelled out what here inches right here. We've cancelled out centimeters So do we want it in meters? No, no, so what do we want it? Millimeters, right? So what are we gonna? Multiply this by so what's gonna be on the bottom unit wise one meters. Yeah, and in this case one meter on the top 1000 millimeters So meters now cancel and let's see if we get the same answer, okay? So 5.5 times 2.54 times 1000 divided by 100 And I got 139.7 millimeters and of course again, that's got too many sick things So let's do this time in scientific notation. Okay, when we do that we want to see if it's 1.4 times 10 squared Either way is the correct answer. So you can do these a number of ways. Just use whatever steps that you can remember Are there any questions on this particular problem? Makes sense. So you understand which ones will be given and which ones you'll have to Okay, that's the most that's probably one of the more important things you can know. Can I kill it? We're good