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Perimeter and unit conversion

Sal converts metric unit to help solve a perimeter problem. Created by Sal Khan and Monterey Institute for Technology and Education.

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• can i mutiply the length by 2 and the width by 2 ??
• If you mean can you do that in order to solve the equation then yes. That is actually what Sal does at around the mark in the video. It's also the way that I solved it. You would get
*( 2w + 320 = 720)* After you subtract the 320 from both sides you're left with *(2w = 400)* Divide both sides by 2 to get w = 200. Sal does the same thing at the end of the video but he does it in his head.
• i do not get it how he got 1000 over 1 at
• you should watch the videos in the previous chapter about unit conversions :) after that every conversion will be way clearer :)
• 0.72 * 1000= 720
sir can i do the multiplication like we have 3 zeros in 1000 , so we are multiplying by 100 after the decimal so there are three zeros , can i assume that three zeros after decimals will , 1 zero in place one tenth , second zero in place one hundredth and third zero in place of one thousandths so , i must place my decimal after one thousands , 0.72 * 1000 will become 720 , using this method , is my assumed method correct or incorrect?
• You are using the correct method. I hope you continue to succeed in this topic.
(1 vote)
• why in kilometers have to be big
• There are big things (such as roads) that have to be measured. Think of a car, is it better to say you are traveling at 50000 meters per hour, or 50 kilometers per hour?
• do you have this also where I can print lesson
• 1000 jumps for 3 hour per hour
• what is a converstion factor