Fast Math Trick - Long Division for Maths Reloaded - By tecmath
Transcript
00:0-1 | get a and welcome to the Tech Math channel . | |
00:01 | In this video , we're going to be continuing on | |
00:03 | looking at some special little trick when dividing by the | |
00:07 | nine times table , how to get answers instantly with | |
00:09 | this . So in the first video we're just introducing | |
00:12 | into this trick and using it quite an easy example | |
00:14 | . So the links right here , if you haven't | |
00:16 | seen that one , this one , we're going to | |
00:18 | start dealing with things like remains and how you deal | |
00:21 | with those in the next one , we're going to | |
00:22 | actually go into bigger numbers . So here we go | |
00:25 | . I recommend if you haven't seen that first video | |
00:27 | , go back and have a look , but you | |
00:28 | might be able to pick up off what we're doing | |
00:30 | right now . So this one is going to end | |
00:32 | up with a remainder . Okay , so say we | |
00:35 | get a number , like I'll better get a pen | |
00:37 | going here And we start with a number such as | |
00:41 | , um , let's say 121,031 and 31 we divide | |
00:48 | this number by nine . Okay , we can tell | |
00:51 | this number is going to have a remainder because funnily | |
00:54 | enough you can tell these digits here . Don't add | |
00:56 | up to a number that is divisible by nine . | |
00:58 | Okay , you might be able to notice that one | |
00:59 | plus two plus one is four plus three is seven | |
01:04 | plus one is eight . So there's actually going to | |
01:06 | probably be a remainder of eight . I can tell | |
01:07 | you that right now . Okay , so let's get | |
01:10 | this answer going right now . All right . So | |
01:13 | first off what we did is we put this number | |
01:15 | down here . This number as you remember , the | |
01:17 | very first number becomes the first part of our answer | |
01:19 | . So this one is the first part of our | |
01:21 | answer . Then we Add to to get the next | |
01:23 | part three . We had one to get the next | |
01:26 | part four . We had nothing to get the next | |
01:29 | part which is also four . And then we add | |
01:31 | three to the next part , which gives us the | |
01:34 | next part of our answer , which is seven . | |
01:35 | Now this very last number , we do something different | |
01:38 | . We add it but we don't actually add it | |
01:40 | to the answer here . We're going to then add | |
01:42 | it and then divided by nine . I'll show you | |
01:44 | what I mean . So seven plus one is eight | |
01:47 | and we divide this number By . 9.8 divided by | |
01:50 | nine . You can't do so the remainder becomes an | |
01:54 | eight . We'll put that down as remainder eight . | |
01:57 | Okay . Hey , that's pretty easy . Yeah , | |
01:59 | I told you was going to be a reminder of | |
02:01 | aid as well . All right . Hopefully you do | |
02:04 | really , really well with that . In the next | |
02:06 | video , we're going to go to some bigger numbers | |
02:08 | , you know , some some much bigger numbers where | |
02:11 | you are going to have to carry the odd little | |
02:12 | thing across . Okay . It's not always as easy | |
02:15 | as a lot of people put the examples always on | |
02:17 | Youtube , where there are always the ones which works | |
02:19 | so easily . Okay . Some of them are a | |
02:21 | little bit harder . This next video is going to | |
02:23 | have a look at that . So I hope to | |
02:25 | see you then . Bye . |
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Fast Math Trick - Long Division for Maths Reloaded is a free educational video by tecmath.
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