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

Converting measurements - metric distance made easy - By tecmath

Transcript


00:00	Good day . Welcome to the Tech mouth channel .
00:02	What we're doing in this video . We're gonna be
00:03	looking at metric units , units of length . And
00:06	we're gonna be looking at how to convert between these
00:09	. Uh , now this is going to present some
00:11	difficulty because obviously we're gonna be talking about units of
00:14	length . You're all going to be having different size
00:16	computer screens and things like this . So it's sort
00:19	of , it's silly if I just put up a
00:20	rule and say this is how big they are ,
00:22	even though I have got to rule it out here
00:23	. So I really , really recommend when you do
00:25	this , you get yourself a tape measure and you
00:28	have a look at this . Yeah , first off
00:31	, I'm just going to go through the basic units
00:33	of length . So the most basic honorably is a
00:35	meta . Now a metal write this down here .
00:39	It's about what this , we have a meter and
00:43	the symbol for this is just , okay , so
00:47	you might say four and which is four m .
00:49	Now , a meter is around about say , say
00:52	we had a car or say something like this .
00:54	If I had a car , um , it'll be
00:57	round about for a standard sized car and I know
01:00	all cars sort of varying size . We've been looking
01:03	at meters probably around about this whole here . Okay
01:08	. Or maybe for some people here , for a
01:11	lot of people usually , um , eatery , say
01:13	the distance that they step . Okay . So if
01:17	you're walking along , so for a fairly big size
01:20	step , Usually the pretty drop all drawing their usually
01:25	that fair size step , there is about one m
01:30	. Okay , so we'll keep that one in mind
01:34	and that's the most basic unit of measurement . So
01:38	I don't get that at all . Leave it there
01:41	for the minute . And basically , if you get
01:43	a meter and you get 1000 m , 1000 steps
01:48	, okay ? So if we get 1000 of these
01:51	, 200,000 of these meters and take 1000 steps ,
01:57	you end up with what's known as a kilometer kilometer
02:03	. I usually actually think about that . It's about
02:04	the distance of 1000 steps . Um , fair size
02:08	steps . It's also the distance . Say we do
02:10	used to actually measure the distance between cities and that
02:13	sort of deal . So 1000 of these meters is
02:15	called a kilometer . We want . That is K
02:17	. M and here we go . The other way
02:22	we can divide uh , we can divide meters up
02:26	into 100 parts and we end up with what is
02:31	known as a centimeter a centimeter And I am going
02:35	to Roy write this in a second a centimeter .
02:39	Have you ever seen those rulers ? Maybe you have
02:41	, Maybe you haven't , They look a little bit
02:42	like these ones here . Um , you see that
02:45	I have market each on here , it's about 2.5
02:48	centimeters . So each one of these is a centimeter
02:51	but a centimeter is usually about on these , these
02:53	good foot long sort of rulers . Uh , they're
02:56	30 centimetre rules a lot of the time . Okay
02:58	, so centimeters about the wit say of a box
03:01	of matches or say a , you know , A
03:06	teenager's book sort of thing . So this is about
03:09	one cm . Okay , and the way we write
03:12	this is saying Again , I really recommend you have
03:17	a look at these on a tape measure . You
03:19	can divide cm up into 10 parts and we end
03:22	up with what is going as millimeter millimeter . Now
03:28	millimeter is probably the smallest of the most typical types
03:32	of units we use . We can get into nanometers
03:35	and micrometers And what sort of deal boy ? Just
03:37	going to go down two millimeters . And these ,
03:41	you know , Stephen a ruler each one of these
03:44	little uh spots here is a millimeter . So when
03:48	you see them they look about the width of a
03:50	small and the length of a small and or say
03:52	something like that . Okay . Or maybe they even
03:55	the width of a match actually with the matches .
03:58	Probably several millimeters so that they're quite small as you
04:01	probably get the idea 10 of these in a centimeter
04:05	. There's 100 centimeters in a meter is 1000 m
04:08	in a kilometer . So let me write that out
04:10	in a usable way . And this is the way
04:13	that I would recommend that you remember these . So
04:16	first off , it's a really , really good thing
04:18	that you can remember those different units and I'll show
04:21	you how I would actually remember these . Now I'm
04:23	just going to write the symbols down to do this
04:26	. So say we start with kilometers , the biggest
04:28	ones first , then we have 1000 of these ,
04:32	123 Then we have latest we have 100 of these
04:38	. 12 we have centimeters 10 of those and we
04:42	have mm . Okay , now I'm gonna draw these
04:47	thousands , but I'm not gonna draw them as zeros
04:49	. I'm actually gonna draw them as jumps . So
04:51	one , two , three , There's 1000 of them
04:56	. Okay . And the meters centimeters there's 100 .
04:59	So that's two jobs , 2012 For every zero drawing
05:03	a jump And for sentiment is two . Could only
05:06	10 . I'm gonna draw one jump . Okay ,
05:08	so you can see 3-1 as you go down .
05:12	Um , and this is a really , really handy
05:14	little way of working these out . Just remember biggest
05:17	or smallest and then there's 321 and you should be
05:20	able to use this to convert between the units of
05:23	length . Okay , so you don't remember the exact
05:25	how many are in because this will come to you
05:27	pretty soon after using this there , I'll give you
05:30	an example this , say I want to know uh
05:34	How many cm 40 were . Okay , that equals
05:40	how many centimeters , Well I'll get 40 and I'm
05:47	going to go from this one centimeters . The actual
05:52	going from millimeters to centimeter some going from this one
05:55	to this one from here to here . As you
05:58	see , I'm jumping this way one told me .
06:01	So at the end of this number as a decimal
06:03	place , unless it's given there's a decimal place at
06:05	the end of this number , we jump one time
06:08	. So one time the desk place will end up
06:10	there . Like I said this there's a decimal place
06:14	is going to end up between the four and zero
06:16	here , so we just actually right , this is
06:18	for , It really makes you feel good , you
06:20	can write as 4.0 from the minute , but they
06:23	mean the same thing , so there's four cm equal
06:26	is the same as 40 . Okay , see how
06:29	to use this , whatever I give you another one
06:34	. What about we do say I have a look
06:37	at that . Five kilometers and I want to know
06:41	how many meters that is . Yeah , there's 1000
06:45	m in two km . So you might be able
06:47	to work this out , but I'm going to work
06:49	it out using this table here because we know from
06:51	kilometers and we're going 123 tomatoes . Okay , so
06:55	we're going this way 123 as a five , And
06:59	we made this way 1 , 2 , 3 .
07:02	Okay , let's do that . Uh , don't even
07:04	draw the little jumps 12 three and under those ,
07:09	I'm going to draw Zeros . Okay . The decimal
07:12	places up there . So we have 5000 m and
07:18	that makes sense because one km is 1000 m ,
07:20	so two km is 2000 m and five km is
07:25	5000 million . Okay , let's go another one .
07:30	I'm going to do two more altogether . So what
07:33	about we have a look about one uh , signal
07:38	, we'll have a look at because I want to
07:41	rub out that would 195 centimeters and I've chosen that
07:45	one because that's , that's all I am . You
07:46	might even measure yourself and and see how many centimeters
07:49	you are and then convert this to say millimeters or
07:52	meters or even kilometers . Uh , probably not as
07:55	useful doing kilometers , but I want to know how
07:57	many meters I am . Okay . Yeah . When
08:04	we're going from centimeters to meters , we're going from
08:06	this one , this one and we're gonna jump 12
08:09	times . So on the 195 the decimal place you
08:13	don't see it is at the end there , we
08:14	just don't draw it on and we're jumping 12 times
08:18	that way . 12 So the decimal place ends up
08:20	here . This is 1.95 m . Uh , we
08:26	might even call that one m And 95 cm .
08:32	You see how that is ? So I'm not actually
08:34	a roundabout , just almost two m . I am
08:37	pretty tall . You might be able to look at
08:38	and go , oh , maybe looking Jeez , he's
08:40	pretty sure , I don't know , I don't know
08:42	how tall you are . Okay , let's do one
08:46	last one . Let's say we're going to change this
08:48	time . I'm going to change from say , What
08:51	about a change from 1.401 baiters . And I want
08:59	to change this into millimeters . I've chosen this one
09:03	for a reason and that's because We're actually going to
09:06	we're going from m two and it's actually multiple jumps
09:10	. Do you see that ? So we're gonna go
09:11	from millimeters to centimeters 2mm cm two cm 2 mm
09:18	. You can see this , you don't need to
09:20	actually then change at the cinema is changing millimeters to
09:22	see how many entitled we jumped . We're going we're
09:25	gonna we're gonna be jumping this way . We got
09:26	a decimal basis so we don't I'm just gonna write
09:29	it down here , we're gonna use this decimal place
09:31	and see how many times and jumps jumping in this
09:33	direction . You can see this jumping 12 straight on
09:38	, so one To three decimal place ends up .
09:43	Yeah , So this is 1000 401 . You're going
09:47	to see the order of the number stays the same
09:50	. Okay , and this is correct . This is
09:53	actually how many millimeters are ? 1.401 m . So
09:58	hopefully that was the some helped . You think it's
10:01	a really , really handy little way of converting between
10:04	these and Especially , you know , if if it
10:07	starts getting stuck with him , just remember biggest and
10:09	smallest and then there's 321 idea . Anyway , hopefully
10:14	that was just some help . We'll see you next
10:16	time .

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