Easy fraction trick you should know - Free Educational videos for Students in K-12

Easy fraction trick you should know - By tecmath

Transcript


00:0-1	Good day , how fast can you solve this question
00:02	? Three quarters of 15 , you've got five seconds
00:05	go , time's up . If you've got the answer
00:12	of 11 and a quarter , congratulations , you got
00:15	the right answer . If not , I'm going to
00:17	show you right now . How'd it work out these
00:20	questions instantly and easily ? So I'm gonna start out
00:23	with an easier type of question here and I'll get
00:25	back to my three quarters of 15 . So if
00:28	for instance , I was going to work out a
00:30	fraction of a number , it's fairly simple , I'm
00:32	going to use an easy example , say I was
00:33	working out three quarters of 12 . Now the way
00:36	to do this is fairly simple . Three quarters of
00:39	12 , a quarter of 12 , well that's going
00:41	to be 12 divided by 4 , 12 divided by
00:43	four is equal to three . Then what I do
00:46	is I say one quarter of 12 is equal to
00:48	three or three quarters of 12 is going to be
00:51	three times as much three times three we would have
00:54	an answer of 93 quarters of 12 is equal to
00:58	nine when you're doing this , however , it doesn't
01:01	matter whether you do the division first or the multiplication
01:04	or the multiplication first , then the division , we
01:06	could have easily said 12 times three is 36 divided
01:09	by four is equal to nine . And that's precisely
01:12	what we're going to do for some of these questions
01:14	, especially where you have a remainder in that first
01:16	step otherwise , so let's get back to our initial
01:20	example . If you were doing the following three quarters
01:24	of 15 , how would I go through and do
01:27	this ? Well , the first off , if I
01:28	go 15 divided by four , I can see straight
01:31	away , I'm going to get a number with a
01:33	remainder 15 divided by four is equal to 334 to
01:36	12 , but it leaves me three left over ,
01:38	so it's three and three quarters and I'm going to
01:39	multiply by three , it's me , Nikki , so
01:42	what I'm gonna do first instead is I'm going to
01:44	multiply by 3 , 15 times three is 45 45
01:49	divided by four . Well , that's not so bad
01:52	. 45 divided by four . We get our answer
01:54	. 45 divided by four , is 11 , 11
01:56	, fours of 44 we have one left over ,
01:59	we put that over our denominator here And we get
02:03	11.5 and that's how easy these are to work out
02:07	. So What about I give you a couple of
02:10	these that you can practice by yourself now remember ,
02:13	you may do the division part of the fraction first
02:15	or the multiplication part first , depending on what's easiest
02:19	for you . So the following questions you are going
02:22	to get , what about we start out with 4/5
02:25	of 45 . Well then move on to 2/3 of
02:30	23 And then last of all we will get to
02:35	3/8 of 27 . So what about your pause the
02:40	video and give these ago . And by the way
02:42	, if you like this trick and maybe you currently
02:43	use it . Don't just eyeball the like button ,
02:46	push down hard and declare your love for the tech
02:47	mouth channel . Subscribe for more math tricks . So
02:50	let's get to our answers . The first question 4/5
02:54	of 45 . Now , if this number on the
02:57	bottom goes into the number we have here easily ,
02:59	I tend to divide first , so 45 divided by
03:02	five , Nice and easy . 45 divided by five
03:06	is equal to nine . The top number here is
03:08	a multiplication number nine times four we have our answer
03:12	which is 36 . Now the next one we have
03:16	pretty simple 23 . Now look three doesn't go into
03:20	that very nicely . So what I'm going to do
03:22	first is I'm going to do the multiplication part .
03:24	1st 23 times two is equal to 46 . And
03:29	then I'm going to divide by 3 46 divided by
03:32	three . Hey , that's not too hard because three
03:34	times 15 is 45 And we have one left over
03:38	. That's one over this bottom number here . 1
03:41	3rd are answer 15 and a third to our last
03:45	question 3/8 of 27 . That doesn't go into 27
03:49	. Very well . So once again I'm going to
03:51	multiply first . What is 27 times three ? Ok
03:55	, It's not too bad a question 27 times three
03:57	is 81 I'm going to divide that by eight .
04:00	Which is a simple question 81 divided by eight .
04:03	Well , 10 , 8 to 80 And we have
04:06	one left over , we get our answer 10 and
04:09	one over . We use that bottom denominator . They're
04:13	done and dusted anyway . That's all for this video
04:16	fractions . You're now part of the three out of
04:18	two people who understand them really well and you want
04:21	more fractions tricks ? Well , we have plenty of
04:23	them here at the tech match channel . Check out
04:25	our links in the description below . And as usual
04:27	, if you like this trick , please do a
04:29	little bit more than just looking at the like button
04:31	smashed down on it and leave a comment . A
04:33	big shout out and thank you to my patrons .
04:35	There's 10 of you Now . There is a link
04:37	in the description below . If you wish to support
04:39	my channel , it is greatly appreciated . And once
04:42	again , I thank you anyway , we'll see you
04:44	next time . Bye .

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