Times table Trick (Elevens) - Fast Mental Multiplication Math Trick - By tecmath
Transcript
| 00:0-1 | get and welcome to the Tech Math channel . The | |
| 00:02 | question in this video is how fast can you times | |
| 00:04 | by eleven's how fast can you times any two digit | |
| 00:07 | number by eleven's ? Because it's something you should be | |
| 00:09 | able to do instantly . And I'm going to show | |
| 00:11 | you how right now . Okay , so What about | |
| 00:15 | we had a question like 63 times 11 . How | |
| 00:20 | would you get an instant answer to that ? The | |
| 00:21 | instant answer being 693 . I'm going to show you | |
| 00:27 | how to do this right now . So the way | |
| 00:29 | that we get our answer is this , we write | |
| 00:32 | our six . That's the first part of our answer | |
| 00:35 | . We leave a space . We write the three | |
| 00:38 | . That's the last part of our answer . And | |
| 00:40 | then what we do is we add these two numbers | |
| 00:42 | together . Six plus three is nine . That's our | |
| 00:46 | answer . Pretty cool . Right ? I'll give you | |
| 00:49 | another example . It's so easy . This I really | |
| 00:53 | , really like this trick . Okay . I think | |
| 00:55 | anyone could do this trick . Anyone could be a | |
| 00:57 | journalist at the 11 times table . So Let's give | |
| 01:00 | it another go . What about you give this one | |
| 01:03 | a go . What's 32 times 11 ? Alright . | |
| 01:07 | Hopefully you're getting the answer of three . We add | |
| 01:13 | these three and 2 is five And then to 352 | |
| 01:19 | . How did you go with that ? Pretty cool | |
| 01:22 | . Right . All right . Is it always so | |
| 01:25 | easy ? Okay , occasionally you need to use your | |
| 01:27 | brain , brain cells , your neurons a little bit | |
| 01:29 | more and get those synapses working . And and that | |
| 01:33 | sort of deal because occasionally you will need to carry | |
| 01:35 | across numbers . An example of this uh would be | |
| 01:40 | say something like what ? About 78 times 11 . | |
| 01:44 | Okay , we write the seven down . We go | |
| 01:47 | , I'll get a different color here . So we | |
| 01:48 | write the seven down to get the first part of | |
| 01:50 | our answer . And then what we do , we | |
| 01:52 | have our last part of the answer here , which | |
| 01:54 | is the eight . We add these guys seven plus | |
| 01:57 | eight . We get the answer of 15 . So | |
| 01:59 | to deal with this because we only have this little | |
| 02:01 | space here , We put the five here and then | |
| 02:05 | we carry the one across . So one plus 7 | |
| 02:08 | Is eight . The answer is 858 . Pretty good | |
| 02:14 | . Yeah . Okay , I'll give you one more | |
| 02:16 | example of that and then I'll leave you be and | |
| 02:18 | uh let you uh hopefully get on and learn something | |
| 02:22 | , even you . Something different . Um Okay , | |
| 02:25 | what about this one ? What about 57 times 11 | |
| 02:30 | . Okay . The instant answer to that is We | |
| 02:35 | get our five . We add these two guys , | |
| 02:39 | We get 12 . So this is going to become | |
| 02:42 | a six . That's going to be a two and | |
| 02:45 | that's going to be a seven . All right . | |
| 02:48 | Hey , look , I said , I'd leave you | |
| 02:49 | be , but I'll show you just a little trick | |
| 02:51 | that you can do this instantly in your head , | |
| 02:53 | even even quicker if you have to carry . So | |
| 02:56 | you have something like 83 Times 11 . Now , | |
| 03:01 | what you might notice is if these two numbers , | |
| 03:04 | you might look at straight away and go , they're | |
| 03:05 | going to be more than 10 . So instead of | |
| 03:08 | writing a here , Add 1 to it , right | |
| 03:10 | , a nine then what you do is you think | |
| 03:13 | , well , what was the units answer to this | |
| 03:15 | going to be , you know , it's going to | |
| 03:15 | be a plus three is 11 . So the the | |
| 03:18 | units answer was one and then three . That's the | |
| 03:22 | way you can do it instantly in your head . | |
| 03:23 | Ah look , I'm gonna give you one that you | |
| 03:26 | can try to do in your head right now . | |
| 03:28 | Okay . What about we do that ? What about | |
| 03:31 | Oh , try and think on off the top of | |
| 03:33 | my head , 67 times 11 . All right , | |
| 03:37 | so that's above 10 . So we're not gonna write | |
| 03:42 | 16 . We're gonna write a seven down . The | |
| 03:45 | units , answer to 6-plus 7 Would be 13 . | |
| 03:48 | So , three seven . Pretty good . Hopefully you | |
| 03:54 | really like that trick . It's a great little trick | |
| 03:55 | are for doing 11 times tables instantly in your head | |
| 03:59 | . And what's more this actually works for ? Even | |
| 04:01 | bigger numbers than 11 . As I'll show you in | |
| 04:03 | a video that I'm going to link right up right | |
| 04:05 | now . Okay , so this will work if you | |
| 04:07 | try to do a number 7622 times 11 , A | |
| 04:12 | similar trick works for that . 11 times tables are | |
| 04:14 | so easy . All right , so , the next | |
| 04:17 | time . |
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Times table Trick (Elevens) - Fast Mental Multiplication Math Trick is a free educational video by tecmath.
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