Fraction of amount and percentage of amount - By tecmath
Transcript
| 00:00 | Hello . This video is about how workout fractions and | |
| 00:04 | percentages of an amount . So here we go . | |
| 00:06 | First off we're gonna look at how to work out | |
| 00:08 | fractions of an amount . So All this launch straight | |
| 00:12 | into an example what is a quarter of eight now | |
| 00:15 | to work out a quarter or something ? As you | |
| 00:17 | probably really worked out your divided by four half of | |
| 00:20 | something you've divided by two bottom number and a fraction | |
| 00:22 | I always think of as a dividing number . So | |
| 00:25 | do we get and we divided up into four equal | |
| 00:28 | parts as you see . The answer is to okay | |
| 00:32 | so a quarter of eight is too yeah that's all | |
| 00:36 | pretty well and good but it is going to get | |
| 00:39 | more complex and you probably realize this already . So | |
| 00:41 | what we're going to get you to have a look | |
| 00:42 | at is how to work out just using maths . | |
| 00:45 | Okay so here we go A quarter of eight , | |
| 00:49 | how would do this ? Its first off as you | |
| 00:52 | probably already remember wherever you see of , you can | |
| 00:54 | just change that two times . So we're going to | |
| 00:57 | end up with a quarter times then you want to | |
| 01:00 | change eight so it's over one . So it's all | |
| 01:02 | it's also a fraction , so we end up with | |
| 01:04 | one quarter times 8/1 . Then it's just a matter | |
| 01:07 | of multiplying them straight out , one times eight is | |
| 01:09 | A and four times one is four . So we | |
| 01:12 | have the answer of 8/4 . So eight divided by | |
| 01:16 | four . The answer is to and that's the answer | |
| 01:19 | . A quarter of a is too as you saw | |
| 01:22 | before . That's pretty much easily how you work it | |
| 01:25 | out there . So I'll just go through one more | |
| 01:27 | example . An example here is three quarters of a | |
| 01:31 | okay , yeah , this is as you probably already | |
| 01:34 | guessed , going to be three times as much as | |
| 01:35 | our last answer . So I'll give you a little | |
| 01:37 | hint the answer is going to be six . What | |
| 01:39 | you do is you put the 8/1 and again , | |
| 01:41 | what you end up doing is you Just multiply these | |
| 01:44 | guys out . So three times eight is 24 , | |
| 01:46 | four times 1 is four . So 24 divide about | |
| 01:49 | four . And our answer is six . As you | |
| 01:52 | can see here , we divide up little things into | |
| 01:55 | four . You've got one quarter , two quarters , | |
| 01:58 | three quarters and three quarters is six . The next | |
| 02:03 | thing we'll look at is how to work out percentages | |
| 02:05 | of amount . Example , here is 30% of 90 | |
| 02:09 | . Okay , so the first thing you do with | |
| 02:11 | this is a change of 30% into a fraction Which | |
| 02:14 | is 30 over 100 once again of means times and | |
| 02:19 | then you're putting 90 into a fraction as well , | |
| 02:21 | 90/1 , 9 divided by one , still nine a | |
| 02:23 | year . So then you just multiply this out . | |
| 02:25 | 30 times 90 . 2700 . 100 times one is | |
| 02:29 | 100 . And then you have to just work out | |
| 02:32 | what 2700 is divided by 100 , which is 27 | |
| 02:38 | . Another example , this is say 25% of 80 | |
| 02:42 | . Okay , so do you remember the first thing | |
| 02:44 | you have to do here ? Well , that's right | |
| 02:47 | . You got to change the percentage into a fraction | |
| 02:49 | . So you just put that over 100 and 25% | |
| 02:51 | becomes 25 over 100 of becomes time . An 80 | |
| 02:56 | becomes 80/1 . So you end up with 25 over | |
| 02:59 | 100 times 80/1 . Multiplying these out 25 times 80 | |
| 03:07 | , 100 times one is 100 . So you end | |
| 03:10 | up with a fraction 2000 over 100 , which , | |
| 03:14 | When you work it out equals 20 . So that | |
| 03:17 | completes how to work out fractions or percentages of an | |
| 03:21 | amount . Good luck with those |
Summarizer
DESCRIPTION:
OVERVIEW:
Fraction of amount and percentage of amount is a free educational video by tecmath.
This page not only allows students and teachers view Fraction of amount and percentage of amount videos but also find engaging Sample Questions, Apps, Pins, Worksheets, Books related to the following topics.
GRADES:
STANDARDS:
