Mental Addition Trick - Add large numbers in your head instantly! - Free Educational videos for Students in K-12

Mental Addition Trick - Add large numbers in your head instantly! - By tecmath

Transcript


00:0-1	Good day . Welcome to Tech Math Channel . What
00:02	we're gonna be having a look at in this video
00:03	is we're going to be having a look at a
00:04	method of addition to slight tweak on normal edition and
00:08	it's called no carry edition . Like the name suggests
00:11	it pretty much it tries to avoid carrying as much
00:15	as possible . Look , this method is not much
00:17	faster than normal edition or grant that straight away ,
00:20	but it's mainly for people who struggle with , with
00:25	carrying a cross or possibly are people who are just
00:27	looking for a slight different method of adding and subtracting
00:30	and things like this . Okay , so let's have
00:33	a quick look at this . Now , the way
00:34	that this works is as follows . Um , first
00:37	off , I'll tell you what , Oh , give
00:40	an example and then we'll look at how we'll work
00:42	this out . So say we're going to add 3145
00:47	6182 . and 9128 . Okay , that'll do us
01:00	for the start . Okay , So the way this
01:04	works is as follows , we're gonna be adding columns
01:07	as we go . All right . Uh but when
01:10	we do this , we're going to be we're gonna
01:12	be looking for complementary pairs just to help ourselves out
01:15	. We're going to get these totals , we're gonna
01:16	put them on slightly differently to how we do in
01:19	normal edition . Uh But one of the advantages of
01:21	this is we can actually , instead of adding left
01:24	, right to left , we can actually add left
01:26	to right . And this is really good because it
01:29	starts to uh you know , we start out getting
01:32	the most significant figures first , the least significant figures
01:35	last . And so the answer starts to get more
01:38	and more accurate as we go along . So what
01:41	about , I'll show you how to do this .
01:43	So let's start over this side here . Okay .
01:45	So let's look for complementary pairs . Will add all
01:47	these together , complementary pairs . These are ones that
01:49	add up to 10 . So do you see any
01:51	that we have seven and three there ? 10 ,
01:53	1925 . Okay . And this Is 25,000 , so
01:59	we can put this straight away in this 25,000 column
02:04	. Okay . The number finishes that the units part
02:08	of it finishes . There we go from there .
02:09	Okay . One plus one plus one plus one .
02:14	Easy is four . All right . So we're gonna
02:16	be looking at an answer . It's about 25,000 .
02:20	25,400 . We're getting closer . Okay , Let's add
02:24	these next ones together . eight and 2 is 10
02:29	18 . Alright , Let's put that in I think
02:33	. Alright , it's getting closer and closer , isn't
02:35	it ? 20 minutes a bit more now , maybe
02:37	you know 25,580 . Yeah . Okay let's have the
02:43	next ones together . Uh Tonight is ted 18 .
02:49	Okay , I'll put those ones in as well .
02:51	So now let's add these all together . Okay so
02:55	we're gonna some what we have here now and get
02:57	our grand total here . So let's do this as
03:00	follows . Okay . We have eight , we have
03:02	a nine , we have a five , we have
03:06	a five and we have a two . Okay .
03:09	25,598 . As you saw , we got closer and
03:13	closer to our answer as we went along . Okay
03:15	. With 25,025,425,580 . Okay . So we got closer
03:22	and closer and closer to our aunts . And so
03:24	I think it's one of the advantages of this um
03:27	You will notice occasionally you do get little carries at
03:29	this stage . I think it's easier possibly to do
03:33	that at that stage , but they're usually easier numbers
03:36	to work with . So let's have another look at
03:40	using this . Okay . I will rub this out
03:45	and we will start with another question . All right
03:49	. What about we have a look at another 1
03:55	. 3170 for 609 . 3087 . 1962 . 5000
04:13	143 . Uh Let's face it . That'll do it
04:17	for the hours . I'm gonna run out of room
04:18	, aren't ? I'll tell you what You give this
04:20	one to go . Alright , pause the video .
04:22	Give it a go . All right . Hopefully you've
04:24	done it . Hopefully you paused it . We'll see
04:26	the answer is I'm gonna be going from again left
04:29	to right here . So let's add these together .
04:31	I don't see any complementary numbers . So let's uh
04:35	Let's just add them as we go . 367 ,
04:38	12 . Okay . All right . This next column
04:44	. Okay . The hundreds . We have 10 ,
04:47	16 17 . This one here , we have a
04:51	10 icing 25 . This one here . 10 1921
05:02	. 25 . Okay , so let's add them again
05:07	as we go . Uh I should be putting probably
05:09	lions here to meet and everything up , shouldn't I
05:14	? Okay , We have five . We have a
05:16	seven . We have a nine . We have a
05:18	three . We have a one . Okay . So
05:20	we started with 12,000 . We got closer when we
05:23	got 30 13,700 . And just adding these as we
05:26	go along . And you can see we got closer
05:28	and closer and closer and closer to our answer .
05:30	So , how did you go with that one ?
05:32	Hopefully that was the answer you got . Uh Oh
05:34	that hopefully I didn't get the answer just wrong then
05:36	, which does happen occasionally . Um So what about
05:41	I'll give you one last one of these , we'll
05:46	put it on there . Um What about we go
05:51	to 67026708 . What about 9120 for what ? About
06:02	uh 13,000 two . And then finally we'll uh another
06:13	couple up there , we'll do uh just a nice
06:16	small 1 . 100 and 61 and we'll do another
06:22	one which is going to be oh 4227 . Okay
06:30	, now let's add these together . Okay so uh
06:34	huh You're going to start doing these ones , I'm
06:37	going to start doing it from this side . Two
06:39	plus one is three . So we're gonna be looking
06:41	in the 30,000 range because we're in the tens of
06:43	thousands . Now , let's add these next ones up
06:45	. Look for complementary numbers . We have 10 here
06:48	, 1922 . Okay , so this is 20 .
06:52	So we're gonna be looking about 52,000 . Okay ,
06:55	starting these mentally in my head . Okay . We
06:58	have a 10 , 11 , 12 , 14 .
07:03	We have a 10 14 and then finally what we
07:09	have is a 10 18 1926 . Look , I'm
07:13	running out of room , I'm gonna have to start
07:16	moving my are stuff down there . So let's finally
07:20	add what we have here . We have a 6654
07:25	, 3 And a five . So answer 53,000 566
07:33	. Anyway , what do you think of that method
07:36	? That's uh it's not a bad method if you
07:38	want to avoid carrying . It's just a different way
07:39	of looking at mathematics . Okay . That's all this
07:42	is devoted to . It's not always going to be
07:43	the fastest method . I personally find other methods a
07:46	little bit faster than this , But anyway , let
07:48	us know what you think . Okay , see you
07:50	later . Bye .

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Mental Addition Trick - Add large numbers in your head instantly! is a free educational video by tecmath.

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