Nine times table tricks - learn the fast way! - Free Educational videos for Students in K-12

Nine times table tricks - learn the fast way! - By tecmath

Transcript


00:0-1	Good and welcome to the Tech Math channel . In
00:02	this video , we're going to be having a look
00:03	at a few little tricks on how to do the
00:05	nine times Table . This is our a few little
00:07	tricks mainly inspired because I've been teaching my own little
00:10	kids at home how to do the nine times table
00:13	and they've been finding it to be the easiest of
00:16	all the times tables . I used to also was
00:18	when I was a kid , mainly because of these
00:20	two couple of tricks , which I , one of
00:22	which I was shown when I was a kid ,
00:24	another one , which I actually worked out by myself
00:26	, which was a pretty obvious one as well ,
00:28	but maybe you haven't seen it . So anyway ,
00:30	I'm going to show you both these today . Number
00:32	one of them is using your hands to actually work
00:35	out the times table . Another one if you don't
00:37	want to be sitting there counting your hands , is
00:39	one where you can actually look at the number of
00:40	times you by nine and immediately pretty much work out
00:43	the answer off that . So I'm going to go
00:46	through both of these are examples in this video .
00:48	So the first one is going to be the hands
00:50	one and that's , here's some hands I prepared earlier
00:53	. I'm not going to show my own hands .
00:54	My own hands are a little bit not really the
00:56	prettiest things that you ever want to see . But
00:59	these hands I've drawn here , basically I got my
01:03	left hand and my right hand and also have the
01:06	thumbs on either side . So the palms are facing
01:09	towards me . Um And we number these 123456789 10
01:15	. You don't have to draw the numbers on your
01:16	fingers by the way , but you might have that
01:18	helps you . Uh So anyway , how do we
01:21	use this ? Well , so you're going to do
01:23	a question like three times 9 . Well let's kid
01:27	for the third finger . Okay . Three times nine
01:29	. So we can't do the third finger . 123
01:32	this finger here and would fold this finger over .
01:35	Okay . And then we look to the left and
01:37	then we look to the right of this and we
01:39	get our answer through this . So on the left
01:42	we have two fingers . And on the right of
01:47	our fold over finger we have 123-4567 fingers . Okay
01:53	there's our answer 27 . That's how this works .
01:56	It's not a it's a very very easy way of
01:58	working things out . Okay I'll go to a different
02:01	example . Uh I'll just get rid of that .
02:04	Um And let's do the example . Now I'll do
02:07	a bit of a bigger number seven times 97 times
02:11	99 times seven same thing . Okay so we fold
02:16	his finger over And then we count the number of
02:18	fingers on this side which is six 123456 . And
02:23	the numbers on this side Of the fold over finger
02:26	three The answer is 63 . And that's the way
02:30	you can use your hands to work out the nine
02:32	times table . It works for all of them right
02:34	up to our even possibly if you were to say
02:36	um What's 10 times nine and you can look at
02:39	it and then what you could do is you could
02:41	say well you can fold this thumb down I guess
02:45	and then you can say on this side I have
02:47	nine fingers and I have no fingers on this side
02:50	. So the answer is 90 . So that's the
02:51	way it works and if you even have extra fingers
02:54	I actually that will just confuse you . So we
02:56	won't , we won't do that . Um what we'll
02:58	have a look at now is a different way that
02:59	you can also do the nine times table . This
03:01	is the way that I used to generally do it
03:02	as a kid and this is where you are ,
03:06	you use the number and to immediately can work it
03:08	out . So I'll get rid of the hands I've
03:09	drawn and I'll show you how I used to work
03:13	this out as a kid . I'll give you actually
03:15	start this out by writing out a few of the
03:17	times table . So we have one times nine equals
03:21	92 times nine equals 18 , three times nine equals
03:28	27 four times nine Equals 36 . Okay , I'm
03:36	not gonna fit too many mornings , so I won't
03:38	try . I'll just move these there and the way
03:42	this works is this I used to look when I
03:44	was a kid , I used to look at this
03:45	number . The first thing I used to realize ,
03:47	so used to realize that all the answers to the
03:49	nine times table added up to nine . So nine
03:52	is nine , but one plus eight is also 92
03:54	plus seven also equals 93 plus six or so equals
03:57	nine . And the same goes next numbers 45 that
04:00	equals nine . In fact , any number of times
04:01	by nine . Finally enough , you'll find that the
04:03	answer is actually add up to nine or add up
04:06	to a number that nine goes into . And this
04:08	even includes really , really big numbers . Okay .
04:12	But first thing I noticed was that , but the
04:13	second thing I noticed was it . So say we
04:16	have a three here . The way I used to
04:18	do this as a , as a kid as I
04:19	used to look at this and say , well three
04:21	times nine , number under three is a two .
04:24	Okay , so the first part of my answer is
04:26	going to be a two and I used to think
04:27	to myself or because all the answers that your time
04:29	is 19 add up to nine , what number would
04:31	I add to to to get nine ? Two plus
04:35	seven is nine . So the answer is 27 .
04:38	Okay , so this one here , the number 4
04:41	, 4 is 33 plus six equals nine . Our
04:46	answer is nine . Okay , I'll give you another
04:49	one here . I'm just gonna find my eraser ,
04:53	losing the all the things on my screen at the
04:56	moment . Here we go . Just get rid of
04:58	those and I'll write a different one down . All
05:02	right . Say something down like what about eight Times
05:06	9 ? So we look at the eight there .
05:10	Next up their number under eight is seven . Seven
05:15	plus two Equals nine . The answer is 72 .
05:19	Okay . And that works all the way right up
05:21	to uh I guess 10 times nine where you can
05:24	think of that . You know that you can think
05:26	well 10 times nine and you could say the number
05:29	under 10 is nine and nine plus nothing equals equals
05:35	90 . Okay . There's a nine plus , nothing
05:37	is nine . So the answer is 90 . And
05:39	that's the way I've always found that nine times they
05:41	would have been really , really easy earn a link
05:43	onto this . Also a way of actually doing the
05:45	nine times table like any , not nine times they
05:48	were divided by nine instantly . This is where you
05:51	can actually divide really , really big numbers quite quickly
05:55	. Using just a little trick . I have .
05:57	Okay . I hope you found that helpful . Okay
06:00	. See you later . Bye .

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