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Lesson 4: Converting US Customary units

# Same length in different units

The video dives into the concept of converting US customary units, specifically yards to inches. It emphasizes the importance of understanding the relationships between different units of measurement and demonstrates multiple methods for performing these conversions, including using improper fractions. Created by Sal Khan and Monterey Institute for Technology and Education.

## Want to join the conversation?

• Starting at , why does Sal have to go through all that trouble when he can just multiply 36 in. times 4 1\2 yards?
• You could do that, but you're doing several steps inside your head. Sal was just showing the rationale behind making that calculation and breaking it down into its individual steps.
• if all you have to do is multiply the yards by 3 to get the feet and then multiply whatever you get by 12 to get the answer in inches why didn't sal just do that instead of ALL of this?: I know that there are 3 feet for every 1 yard, and when you say, why am I multiplying by 3 instead of saying there's 1 yard for every 3 feet? And the easiest way to think about it is you're going to have a larger value over here, and you're also going to want to have these units right over here cancel out. So yard is canceling out with yard. So you have 1 yard is equal to 3 feet, which is kind of what you already knew. I'm just showing you how the dimensions cancel out. And how many inches are there per foot? Well, we know that there are 12 inches for every 1 foot. And same logic over here, inches is a smaller unit of measurement so it makes sense that you're multiplying by 12. 3 feet is going to be more inches, so i'm multiplying by 12 and also these units cancel out, foot in the numerator, foot in the denominator. 3 times 12 divided by 1 is equal to 36 inches. So you might have already known it. But this is nice to have the dimensions cancel out like this. I know that 1 yard is equal to 36 inches and so we will do this and this and this and referring to what i was saying all the way above why did Sal do ALL of this when all he had to do is multiply the yards by 3 to get the feet and then multiply whatever you get by 12 to get the answer in inches!? (no offense Sal) - also you guy's don't have to read every single word of this "question"-
• I don't understand why we have to learn how to use different units?Why can't we just learn to use one?
• Dude ssssssslllllooooooowwwwwwweeeeeeerrrrrrrrr man
• How do you convert 51/2 (five whole number n half) to inches
• by divding by 2 and it doesn't matter as long as what the whole is is inches
• what did sal mean at ?
• At , he just figured out that the first part of the problem is equal to 4 pints, and he decided to convert it to quarts to be able to simplify the rest of the problem.
• Be awasome