Converting distance measurements - Free Educational videos for Students in K-12

Converting distance measurements - By tecmath

Transcript


00:0-1	Hello . This video is just a quick refresher on
00:02	how to convert between the units used for measuring distance
00:06	. So we'll get straight into it . We've listed
00:08	them up here millimeters centimeters meters and kilometers . They
00:14	had to convert between these . Well , first off
00:16	, I just write a few of the conversion facts
00:19	. Uh , there are 10 millimeters in one centimeter
00:24	, There are a 100 cm in one m .
00:28	There are a 1000 m in one kilometer . Okay
00:34	, So how do we convert between these ? Well
00:35	, first off , I'll consider m two km .
00:39	Okay . Yeah . All right . There's down in
00:44	one kilometer . There is 1000 m . Sorry to
00:48	get to convert between meters and kilometers to convert between
00:54	this one here , which is 1000 to get the
00:57	number one . What I have to do is I
00:59	have to divide by 1000 to convert between km and
01:03	m . Well to get from one , I multiply
01:09	5000 . 2000 m as kilometers or 2000 divided by
01:15	1000 would give me two kilometers and three kilometers se
01:20	or four or so four kilometers as meters were four
01:23	times 1000 Would give us 4000 . Okay , So
01:28	that's that one . The next one will consider is
01:32	converting between meters and centimeters . Okay , so First
01:40	off there is a 100 cm in one m So
01:44	to convert between these two to get from centimetres tomatoes
01:53	To give 100 to one , what we have done
01:56	is we divide by 100 . Okay , so 100
02:00	centimeters divided by 100 equals one m , say 400
02:05	centimeters 400 divided by 100 would give us four m
02:09	and to convert an answer that is meters into centimeters
02:15	We do the opposite three times by 100 . Okay
02:18	, seven m times 100 would give us 700 cm
02:23	. Okay , next off will consider Converting cm two
02:29	. Okay , so in one centimeter There is 10
02:35	. So to convert between these centimetres two millimeters from
02:42	say one centimeter 10 millimeters were times by 10 .
02:46	And it's okay , so seven centimetres seven times 10
02:51	is the same as saying 70 millimeters . All right
02:54	. And to get between from millimeters to centimeters we
02:59	divide by its head . Okay , Um 90 90
03:04	divided by 10 is the same . There's nine centimeters
03:08	. Okay , so what we have here is a
03:10	nice little table , a little uh chart which allows
03:13	us to convert between all the units of uh which
03:16	we use in measuring distance in order to convert between
03:25	these units . The easiest way which I find to
03:27	do it Is because these numbers like 100,000 that we're
03:32	dealing with basically all it involves is moving the decimal
03:37	place a lot of the time and I'll show you
03:38	what I mean by this . Okay , so say
03:41	what I want to convert , I'll start off with
03:44	one . It's a little bit more difficult . So
03:46	I want to convert seven leaders in two kilometers .
03:54	Yeah , to get from m , two km .
03:59	What I do his old go this way . Okay
04:06	, So I divide by 1000 . Yeah , I
04:10	can get my calculator out and I can go seven
04:12	divided by 1000 . I'd get whatever answer I get
04:15	. But I'll show you what I mean by moving
04:17	in decimal place now because I'm dividing this number is
04:20	going to get smaller . So the decimal place is
04:23	going to move that way as you're probably well aware
04:25	that the decimal place after that seven at the moment
04:27	. How many times do I movement ? Well There's
04:30	1 , 2 , 3 Zeros when I divide by
04:34	thousands . That's how many times of movements ? Who
04:36	won ? Two ? That's right decimal place in the
04:40	area . Right ? That in blue and the answer
04:44	becomes a .007 . Okay , so seven m Is
04:50	the same as .007 km . Okay , well through
04:55	another one . Okay , how about this one nine
05:01	0.2 kilometers equals how many millimeters . Okay , so
05:09	to do this , let's think about what we have
05:12	to do . We're going from kilometers two . So
05:17	what we're doing is first we're gonna get a number
05:20	of times that by 1000 Times and answered by a
05:23	100 And times that answer by 10 . So this
05:27	nine point to hear the answer is going to get
05:29	bigger . The number is going to be bigger because
05:30	we're timing . Okay , so how many times do
05:33	I have to move this testimony place here ? Well
05:35	let's count it 123 456 times the answer is getting
05:42	bigger . So the test someplace is going this way
05:44	and it's moving six times 123456 . And we put
05:52	zeros here . Okay so 9.2 km as far as
05:59	millimeters goes is 9,200,000 . Okay we'll give another example
06:09	ago . Okay . What I want to know is
06:14	90 millimeters . Oh I know what that is .
06:20	There's a meters . Okay so how many meters ?
06:25	So let's work this out . What we're doing is
06:30	we're going from millimeters two m . So we're going
06:35	dividing 90 x 10 and then we can divide by
06:39	100 . Okay so my nightie here decimal place here
06:44	. I have to move the decimal place because I'm
06:46	dividing and I'm just gonna get smaller desks . Yeah
06:49	it's going to move this way . The decimals and
06:51	I had to move it one two three times .
06:55	I was counting the number of Zeros So 123 or
07:00	put a zero there . Alright , 90 equals 0.090
07:08	maidens . What about one final example ? Okay ,
07:14	what about 4.38 km equals how many centimeters . Okay
07:27	, okay . To get between these let's have a
07:29	look . So we're going from kilometers and we're moving
07:33	to centimeters so we're going to divide , I have
07:37	4.3 1st we'll get times by 1000 then we have
07:40	two times 100 because we're timing The number is going
07:44	to get bigger . Alright with 4.38 here and I
07:48	count how many times I have to move this decimal
07:50	place . 123 45 So 12345 and I put some
08:00	zeros there . Okay , I'll get rid of that
08:03	decimal place . So In 4.38 km There is 438,000
08:12	cm . Okay , nice . Yeah , what I
08:16	really recommend with this , you really should know how
08:19	to convert between this , this is one of these
08:20	fundamental things with maths that you really should be able
08:23	to do . Um however , what I'd recommend is
08:27	if you start doing it , the first thing the
08:30	bottom , the bottom line , the most basic things
08:32	you should know Is that there are 10 in one
08:37	centimeter But there are a 100 cm in one m
08:42	That there are 1000 m in one kilometer from this
08:49	, you should then be able to attempt to draw
08:53	a diagram like we have here . Okay , and
08:57	in that same method which we did before using this
09:00	, you should be able to convert between meters kilometers
09:04	centimeters millimeters without really that much of a problem .
09:08	The way why not recommend especially doing a building trade
09:11	or something like that to be able to convert between
09:13	is millimeters and m where okay to go from m
09:19	two . All up Timing by 110 so it's 1000
09:25	. So you get used to this conversion 1000 in
09:28	between each time anyway , I hope you get really
09:31	good at these . Good luck with that like I
09:33	bought .

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