Length - Units And Conversion
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00:00Hi kids! Today we will learn measurement units of length and its conversion. So
00:08let's get started. We will first learn about measuring length in metric system.
00:16The standard unit of length is meter. A meter is divided into 100 equal parts
00:25called centimeters. One meter equals 100 centimeters. One centimeter is divided
00:35into 10 equal parts called millimeters. One centimeter equals 10 millimeters. We
00:45measure very big things like length or roads in kilometers. One kilometer equals
00:54a thousand meters or a thousand meters equals one kilometer. Now let's learn how
01:04to convert one unit into the other unit. Let's first learn converting centimeters
01:11to millimeters. One centimeter equals 10 millimeters. So whenever you have to
01:19convert centimeters to millimeters, you will multiply them with 10. Let's convert
01:27two centimeters to millimeters. Multiply two with 10. Two multiplied by 10 equals
01:3720. So two centimeters equals 20 millimeters. Let's convert three
01:45centimeters to millimeters. Three multiplied by 10, we get 30. So three
01:55centimeters equals 30 millimeters. So we multiply with 10 if we want to convert
02:02centimeters to millimeters. Now let's learn converting millimeters to
02:09centimeters. 10 millimeters is equal to how many centimeters? 10 millimeters
02:17equals 10 divided by 10 centimeters. 10 divided by 10, we get 1. So 10 millimeters
02:29equals 1 centimeter. 20 millimeters is equal to how many centimeters? 20 divided
02:40by 10 equals 2. So 20 millimeters equals 2 centimeters. So kids, when we have to
02:50convert back millimeters to centimeters, we divide by 10. Now let's learn
02:58converting meters to centimeters. One meter equals 100 centimeters. So 2 meters
03:08equals 200 centimeters. That is, we multiply with 100. Three meters will be
03:19equal to how many centimeters? It will be 3 multiplied with 100. So we get
03:28300 centimeters. So kids, we multiply with 100 if we want to convert meters to
03:38centimeters. Now let's learn converting centimeters to meters. 100 centimeters is
03:48equal to how many meters? For converting centimeters to meters, we divide by 100.
03:57As 1 meter equals 100 centimeters. So 100 centimeters equals 100 divided by 100
04:09meters. 100 divided by 100 equals 1. So 100 centimeters equals 1 meter. 200
04:22centimeters is equal to how many meters? For converting centimeters to meters, we
04:30know we divide by 100. So 200 centimeters equals 200 divided by 100 meters. 200
04:43by 100 equals 2. So 200 centimeters equals 2 meters. 25 centimeters is equal
04:55to how many meters? We know we divide by 100 while converting centimeters to
05:04meters. So 25 centimeters equals 25 divided by 100 meters. Cutting two zeros
05:15and putting decimal after two digits from right, we get 0.25. So 25
05:26centimeters equals 0.25 meters. One centimeter is equal to how many
05:34meters? One centimeter equals 1 divided by 100 meters. So cut two zeros, we have
05:45to put decimal after two digits from right. But as there is only one digit, so
05:53we put one zero on left and insert decimal. So we get 0.01. So one
06:03centimeter equals 0.01 meters. Now let's learn converting kilometers to meters.
06:12One kilometer is equal to how many meters? One kilometer equals 1 multiplied
06:21by 1,000 meters. That is we multiply by 1,000. We want to convert kilometers to
06:30meters. So one kilometer equals 1,000 meters. Two kilometers equal how many
06:41meters? Multiplying two by 1,000, we get 2,000. So two kilometers equals 2,000
06:52meters. Kids, whenever we convert bigger units to smaller units, like kilometers
07:00to meters, meters to centimeters, centimeters to millimeters, we multiply.
07:08When we convert kilometers to meters, we multiply by 1,000. When we convert
07:15meters to centimeters, we multiply by 100. When we convert centimeters to
07:23millimeters, we multiply by 10. Now let's learn converting meters to kilometers.
07:31That is smaller unit to bigger unit. And whenever we convert smaller unit to
07:38bigger unit, we divide. 3,000 meters equals how many kilometers? We will be
07:48dividing by 1,000. So 3,000 meters equals 3,000 divided by 1,000 kilometers.
07:58Cutting three zeros, we get 3. So 3,000 meters equals 3 kilometers. 500 meters
08:09equals how many kilometers? We will divide by 1,000. So 500 divided by 1,000
08:21kilometers. Cutting three zeros, we put decimal after three digits from right. We
08:28get 0.500 or 0.5 kilometers. So kids, let's revise what we learned.
08:38Multiplying kilometers with 1,000, you get meters. Multiplying meters with 100,
08:47you get centimeters. Multiplying centimeters with 10, you get millimeters.
08:55You divide by 10 to convert millimeters to centimeters. You divide by 100 to
09:04convert centimeters to meters. You divide by 1,000 to convert meters to kilometers.
09:14So kids, you need to practice to remember all the things. Now you may go ahead and
09:21take a quiz to learn more. Bye-bye.