Convert kg to pounds (lb) instantly - Fast Mental Math Trick - By tecmath
Transcript
| 00:0-1 | Good day , Welcome to Tech Math channel . What | |
| 00:01 | we're going to be having a look at this video | |
| 00:02 | is a nice , easy trick for converting between kilograms | |
| 00:05 | and pounds of two units of measurements . Okay , | |
| 00:08 | so let's just launch into this and if you like | |
| 00:11 | this video , please remember like button and subscribe . | |
| 00:13 | So I guess the first bit of information we need | |
| 00:16 | when we're doing this is well , we're converting between | |
| 00:20 | kilograms and pounds . How many pounds are there ? | |
| 00:22 | In a kilogram ? And to be exact , ah | |
| 00:24 | , well , but not too exact yet . In | |
| 00:26 | one kg there is about £2.2 and we want to | |
| 00:31 | be a bit more exact , we'd say to about | |
| 00:33 | £2.2046 . Okay . Um , so we're going to | |
| 00:37 | see straight away is we're gonna be using this idea | |
| 00:39 | that there's £2.2 in the kilograms . So our answers | |
| 00:43 | are going to have a degree of error in them | |
| 00:45 | . So how do we go about converting between kilograms | |
| 00:48 | and pounds ? Well , we're going to literally get | |
| 00:50 | the number of kilograms , and we're going to multiply | |
| 00:52 | by the number two points . And I'm gonna show | |
| 00:54 | you how to do this really quickly in your head | |
| 00:57 | , how to multiply by the number 2.2 to get | |
| 00:59 | your answer . It's okay . Let's just start with | |
| 01:02 | an example and see how fast you can do this | |
| 01:04 | particular one , knowing just the information that you know | |
| 01:08 | right now to say we had a nice easy 1 | |
| 01:11 | 35 kg . What is this in pails ? Okay | |
| 01:20 | , so time's up . Did you get the answer | |
| 01:22 | of £77 if you did ? Hey , congratulations . | |
| 01:26 | If you didn't , I'm gonna show you how I | |
| 01:28 | go about doing this . And there's a couple of | |
| 01:29 | steps . The very first thing we do is to | |
| 01:33 | our 35 kg . Here we are , going to | |
| 01:35 | multiply a number by two . We're gonna double it | |
| 01:38 | . So 35 times two we get the answer of | |
| 01:41 | 70 . That's the first thing we do , and | |
| 01:44 | that's taking care of this two part . Here , | |
| 01:46 | we're gonna be trying to work out this little 10% | |
| 01:49 | party , this remaining partners , 10% of what we've | |
| 01:52 | got now so far . How do we do that | |
| 01:54 | ? Well , we're just going to divide our answer | |
| 01:56 | by 10 . So that's the answer , divided by | |
| 01:59 | 10 . Okay , we're gonna add that to it | |
| 02:02 | . So what's the answer here ? Divided by 10 | |
| 02:04 | ? What the answer is 70 divided by 10 is | |
| 02:06 | seven . I'm gonna add that to 70 plus seven | |
| 02:10 | . This is £77 . Pretty simple . Right ? | |
| 02:14 | What do you think of that particular trick ? I'm | |
| 02:16 | going to go through a few more particular questions here | |
| 02:20 | . So what about you go through and give them | |
| 02:22 | a fly as you go . You're just going to | |
| 02:23 | be doubling your answer , working at that 10% and | |
| 02:26 | then adding that on . So let's give that a | |
| 02:28 | go . Okay . What about you give this one | |
| 02:30 | to go ? Uh seven kg . How many pounds | |
| 02:34 | is that ? All right . You should be already | |
| 02:37 | working this out . Okay ? So what's the first | |
| 02:40 | thing you're gonna do here is you're going to double | |
| 02:42 | your answer here , sir ? Seven times too easy | |
| 02:44 | . Is 14 . The next thing you do is | |
| 02:47 | you're gonna work at 10% of your answer here . | |
| 02:49 | So divide by 10 . What's 14 divided by 10 | |
| 02:52 | ? Well , it's 1.4 we're gonna add that to | |
| 02:56 | this and then we're gonna have our answer . So | |
| 02:58 | 1.4 plus four date , our answer is £15.4 . | |
| 03:04 | Okay , so £15.4 as you go with that , | |
| 03:09 | let's go through another one . Okay , one kg | |
| 03:12 | is £2.2 where much is 16 kg . So , | |
| 03:17 | let's see what that is . See if you can | |
| 03:19 | work it out . All right , so double your | |
| 03:22 | answer here , I'll double 16 . Double 16 is | |
| 03:25 | 32 . 32 . We're gonna work at 10 percentages | |
| 03:28 | . So 32 divided by 10 is 3.2 and we're | |
| 03:32 | just going to add our answer to this . So | |
| 03:34 | are 3.2 plus 32 . Here's our answer . £35.2 | |
| 03:43 | . Okay , now , what we're gonna have a | |
| 03:44 | look at is converting back from pounds to kilograms . | |
| 03:47 | So there's £2.2 in a kilogram . So what we're | |
| 03:50 | gonna be doing to go from pounds two kg is | |
| 03:52 | we are going to divide by 2.2 . Now look | |
| 03:55 | , do this mentally , I'm going to do this | |
| 03:57 | in a couple of steps . The very very first | |
| 03:59 | thing I do is I am going to instead of | |
| 04:03 | multiplying by two . What you did before I am | |
| 04:05 | going to divide by two . So we get 2.2 | |
| 04:08 | divided by two . We're left with this answer of | |
| 04:11 | 1.1 . Now , I don't really want to deal | |
| 04:13 | with 1.1 . I'd much rather deal with a number | |
| 04:15 | 11 . So to do this , I'm just going | |
| 04:18 | to chuck a step in between . So usually what | |
| 04:20 | I could do is I can just directly divide by | |
| 04:22 | 1.1 , but I would rather divide by 11 . | |
| 04:25 | So I do sort of an extra step in young | |
| 04:27 | and divide by two . Multiply my answer by 10 | |
| 04:31 | and then divide by 11 . And you're gonna see | |
| 04:34 | this is not as our complex as it might seem | |
| 04:36 | . Okay , so let's have a bit of a | |
| 04:39 | go at this . Let's change £33 into kilograms . | |
| 04:44 | So £33 . So the first thing I do is | |
| 04:47 | we can divide by two . So , what's 33 | |
| 04:50 | divided by two ? 33 divided by two is 16.5 | |
| 04:55 | . Okay , 16.5 , multiplied by 10 . We've | |
| 04:58 | got 100 and 65 . Okay , And now it | |
| 05:01 | is going to divide by 11 . So 165 divided | |
| 05:04 | by 11 . Well , you might look at this | |
| 05:07 | and go , okay , 11 goes into 16 , | |
| 05:08 | 1 time , it's gonna leave a five there and | |
| 05:11 | 11 goes into 55 5 times . Okay , There | |
| 05:16 | is a shortcut for doing that . I'm not going | |
| 05:17 | to get right into that right now . So , | |
| 05:20 | what we have is £33 and this is equal to | |
| 05:23 | 15 kg . All right , let's go through one | |
| 05:26 | more of these . Okay , so let's do £18 | |
| 05:30 | and see what that is in kilograms . Okay , | |
| 05:32 | so 18 divided by two is nine times 10 is | |
| 05:36 | 90 so it's 90 divided by 11 or 90 divided | |
| 05:40 | by 11 years ago . Okay , well , 11 | |
| 05:42 | goes into 98 times and there's two left over . | |
| 05:45 | So it's going to be around about 0.1 point two | |
| 05:50 | . That's our answer . Okay , pretty simple . | |
| 05:52 | Right . And this is going to be in kilograms | |
| 05:55 | . So look , that's a fairly , fairly close | |
| 05:58 | approximation of how are how many kilograms are in £18 | |
| 06:01 | . So look , so what do you think of | |
| 06:03 | that trick ? Let us know in the comments below | |
| 06:05 | . Once again , big shout out to my patrons | |
| 06:08 | . Yes , yes . There is a video on | |
| 06:10 | the way that I said I was going to produce | |
| 06:12 | . Just got caught up with our technical issues . | |
| 06:15 | And as always , thank you for watching . Please | |
| 06:18 | like please subscribe and we'll see you next time . | |
| 06:20 | Bye . |
Summarizer
DESCRIPTION:
OVERVIEW:
Convert kg to pounds (lb) instantly - Fast Mental Math Trick is a free educational video by tecmath.
This page not only allows students and teachers view Convert kg to pounds (lb) instantly - Fast Mental Math Trick videos but also find engaging Sample Questions, Apps, Pins, Worksheets, Books related to the following topics.
GRADES:
STANDARDS:
