Unit rates - Trick for getting 100% - By tecmath
Transcript
| 00:0-1 | Good day . Welcome to Technet channel . What we're | |
| 00:02 | going to be having a look at in this video | |
| 00:03 | is a little trick to getting rates and unit rates | |
| 00:06 | right all the time . Okay . Just something I've | |
| 00:09 | noticed when I have my students doing these and just | |
| 00:11 | a little trick , I can tell them in order | |
| 00:13 | to get this correct all the time . So first | |
| 00:17 | off what a unit rates , unit rates are , | |
| 00:18 | where you're giving something like uh you would be , | |
| 00:22 | I had a question say like you had something which | |
| 00:23 | was $20 for uh five liters . And what we | |
| 00:29 | wanted to know is we wanted to know what the | |
| 00:31 | dollars per liter was . Okay . What each leader | |
| 00:35 | cost in dollars . So how do you go about | |
| 00:37 | working this out ? Well , it's really simple . | |
| 00:39 | You just follow the formula . You've been given the | |
| 00:43 | formula , you've said one of the dollars per liter | |
| 00:45 | that is we do it in this order . Number | |
| 00:48 | of dollars per per amounts always means divide . So | |
| 00:52 | the number of dollars divided by the number of leaders | |
| 00:55 | . So how many dollars we got ? We have | |
| 00:58 | $20 Per always means divide and the number of leaders | |
| 01:03 | is five L . So We can easily work out | |
| 01:06 | our answer what's 20 divided by five , What's for | |
| 01:10 | ? So our price is $4 leader and that's how | |
| 01:14 | you work at unit pricing . There are a couple | |
| 01:16 | of tricks to these and I'll show you these as | |
| 01:18 | we go along . But you just follow the formula | |
| 01:21 | you've been given . Okay you do it in that | |
| 01:23 | order and you can't go wrong . So what about | |
| 01:26 | another one of these ? I'll just give you a | |
| 01:27 | nice easy you want to start off with say we | |
| 01:29 | had Suddenly which costs $35 . It it was There | |
| 01:36 | were three kg of it . And what I wanted | |
| 01:40 | to know . Okay so that was $35 for three | |
| 01:42 | kg . And I wanted to know that price particular | |
| 01:49 | . I got $2 per kilo . So how would | |
| 01:51 | I work this out ? Hey you yell out , | |
| 01:54 | just do it that order . You know the number | |
| 01:55 | of dollars divided by the number of killers say the | |
| 01:58 | number of dollars is $35 per means divide always means | |
| 02:04 | divide . The number of kilos is three . So | |
| 02:06 | 35 divided by three . The answer is 11 . | |
| 02:12 | Okay 11 threes are 33 and there's two left over | |
| 02:15 | . So we're gonna say 11 and 2/3 of a | |
| 02:20 | kilogram . Okay now I'm going to get into some | |
| 02:23 | harder ones of these . Okay so just some variations | |
| 02:26 | anyway . They're not harder because you just follow that | |
| 02:28 | formula right ? So they're not harder at all . | |
| 02:30 | Just gonna remember follow the formula . So just some | |
| 02:33 | variations of these . So another example that might be | |
| 02:35 | where you were you were told , okay , you | |
| 02:38 | bought eight rolls for what ? Say $3.60 and you | |
| 02:48 | were asked what is the price that dollars per roll | |
| 02:53 | ? Okay . So how would you work this out | |
| 02:55 | there straightaway ? The dollars , they're not sitting over | |
| 02:58 | there . It's not a handy little thing where everything | |
| 03:00 | this lines up straight away , you have to actually | |
| 03:02 | find which one surprised that the price is this over | |
| 03:04 | here ? $3.60 . So how many dollars ? $3.60 | |
| 03:08 | . Hey , that's the only variant hospital matt per | |
| 03:10 | , what's permian per always means divide the number of | |
| 03:13 | roles is eight . Okay . So what's $3.60 divided | |
| 03:17 | by eight . And the answer to that is this | |
| 03:21 | is 45 cents per roll . Okay , this is | |
| 03:29 | $30.45 per roll . Nice and easy . Okay . | |
| 03:32 | One last variation of these is occasionally you'll be asked | |
| 03:35 | something like this when you're doing these in maths or | |
| 03:38 | or doing these , say in reality and trying to | |
| 03:40 | work them out . So say you were given something | |
| 03:43 | like you had something that cost $2 For 400 bill | |
| 03:52 | . Okay . And I want to know what the | |
| 03:53 | price was the dollars per liter . Now what you're | |
| 03:56 | going to notice is this first off the dollars , | |
| 03:59 | the dollars of the dollars of the dollars and per | |
| 04:01 | means divide . So that's no problem . But here | |
| 04:03 | we got mills and here we have leaders . So | |
| 04:06 | what we have to do here to find the price | |
| 04:07 | world leader is we have to change this . Mills | |
| 04:10 | is 400 mils into something in liters . So there's | |
| 04:14 | 1000 mills in the leader . Okay , so if | |
| 04:17 | I divide by 405,000 , I divide 405,000 , I | |
| 04:20 | say , okay , we're going to get that . | |
| 04:22 | There's 0.4 liters . This is the same . You | |
| 04:26 | know , they're just unit conversion . So now we | |
| 04:29 | just chuck things in . The formula dollars is $2 | |
| 04:32 | Per . Always means divide . The number of leaders | |
| 04:36 | is 0.4 leaders . So Two divided by 0.4 or | |
| 04:42 | $2 divided by R . cents . You might think | |
| 04:44 | of something like this is too divided by .4 . | |
| 04:47 | Okay , There's five lots of it . This is | |
| 04:49 | $5 . Her leader . Okay . That's all we | |
| 04:53 | got in this video . Hopefully that helped you out | |
| 04:55 | and help you find that nice and easy . We'll | |
| 04:57 | see you next time . Bye . |
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