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Lesson 4: Time

# Finding reasonable unit of measurement example

Sal chooses reasonable units of time activities like baking cookies. Created by Sal Khan.

## Want to join the conversation?

• How many grams are in a kilogram?
• There are 1,000 grams in a kilogram. The metric prefix kilo means 1,000. For example, 3 kilograms is 3,000 grams. This can also be applied to other units of measurement, like liters and meters.
• is this true a long-distance running race, strictly one of 26 miles and 385 yards (42.195 km)or not tell me .-.
• A 26 mi, 385 yd foot race is called a 'marathon' after a famous story where a messenger ran that far after the battle of Marathon back 2500 years ago. Your conversion is right: it's 42.195 kilometers.
• 1000 +5000 = 6000
yes or no
• Yes because 1000+5000=6000 you add the 1 and the 5 and you get 6 then you put the zeros in next to the 6 that you just added from the 1 and the 5 so that is yes to the 1000+5000=6000 so it is yes that it equals to 6000 that is correct so that means it does equals 6000 yes it does equals 6000 EVGENIIZ.
• So, how does it take minutes to bake cookies? You need to wait for yeast and that takes more than half hour, then you need to put all ingridents togethor, make a dough and wait for that too, even if you don't wait for dough to get a bit bigger it'd still take longer time to make dough in a shape of cookies, and then bake them. I don't know how long it should be in oven but I belive with all of this it would take more than an hour. This was in very beginning of the video and I was just curios a bit about it.
• It is true, it usually takes around 30 to 50 minutes
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• do days count, could you say it could someone serveral days to drive to new york to washington
(1 vote)
• Yes! It took us 10 hours just trying to go to New Mexico to ski!
(1 vote)
• A tonne, also called a metric ton, is 1,000 kilograms (about 2,200 pounds). A regular U.S. ton is 2,000 pounds, so a tonne is about 1.1 times as heavy as a regular U.S. ton.

Have a blessed, wonderful day!
(1 vote)
• how many grams are in a kilogram?
(1 vote)
• how many grams are in a kilogram
(1 vote)
• It is 1000g.
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• Does anyone go in the comments anymore?
(1 vote)
• Yes, I do, it can be very helpful sometimes.
(1 vote)
• ja you dont know because you dont know maths wow i mean wow learn maths its a great subject