Fast Math Tricks - How to multiply ANY 2 digit numbers up to 100 - the fast way! - By tecmath
Transcript
| 00:0-1 | Good day . Welcome to take Math Channel . What | |
| 00:02 | we're going to be having to look at in this | |
| 00:03 | video is one of my favorite math multiplication methods . | |
| 00:06 | How to multiply 22 digit numbers faster on the calculator | |
| 00:10 | . So lets us launch straight into this . We're | |
| 00:12 | launching with an example . Can you do this in | |
| 00:14 | six seconds ? 21 times 30 to go . Alright | |
| 00:22 | . I reckon time's up . Did you get the | |
| 00:24 | following answer ? Did you get the answer of 672 | |
| 00:28 | ? If you did . Congratulations . If you're still | |
| 00:30 | looking around for a calculator are still trying to work | |
| 00:32 | it out . I'll tell you what I'm going to | |
| 00:34 | show you right now . How to do this really | |
| 00:37 | , really fast . Okay . It's a pretty cool | |
| 00:39 | method . Okay , so you're gonna have to do | |
| 00:40 | all the more education when you do this ? But | |
| 00:42 | it's uh it's a more efficient way of doing it | |
| 00:45 | . So the first thing we're gonna have a look | |
| 00:46 | at is the units here , the two and the | |
| 00:49 | one . And we're gonna multiply these to get our | |
| 00:50 | units answer . So one time soon will give us | |
| 00:53 | our units answer to . The next thing we do | |
| 00:56 | is we're gonna look at the tennis part of our | |
| 00:58 | answer . We're gonna multiply those different numbers together . | |
| 01:00 | So we have a tense party which is the three | |
| 01:02 | were the tense party , which is to say we're | |
| 01:04 | gonna multiply the 30 by one and we're gonna multiply | |
| 01:07 | the 20 here by two . We're gonna add our | |
| 01:09 | two answers together . So three times one he's three | |
| 01:13 | tooth ones too is four . We're going to add | |
| 01:16 | those two answers together and get the tens part over | |
| 01:18 | answer . Three plus four is seven . The last | |
| 01:22 | thing we're gonna do is we're going to multiply these | |
| 01:24 | two tens parts to get the hundreds part of our | |
| 01:27 | answer . So two times three equals six . And | |
| 01:31 | that's how we get our answer is 672 . Pretty | |
| 01:34 | cool . Right ? I'll tell you what . We'll | |
| 01:35 | go through a couple of examples . Hang up . | |
| 01:37 | Please remember if you do like this video , remember | |
| 01:40 | do like and subscribe to the tech math channel and | |
| 01:43 | if you really want to be a part of the | |
| 01:44 | tech math channel , you'll see that there's a patron | |
| 01:47 | link underneath and it'll be really , really great . | |
| 01:49 | Big shout out to my patrons by the way . | |
| 01:51 | So let's go through another example here . What about | |
| 01:53 | we do 32 times 12 . What about you give | |
| 01:57 | this a go . We'll see what that equals . | |
| 01:59 | So first off , do the units part . Okay | |
| 02:02 | , so we have two times two is four . | |
| 02:06 | The next part we do this rainbow part where it | |
| 02:08 | looks like a bit of a rainbow to get our | |
| 02:11 | tens part . We're gonna go to times one which | |
| 02:12 | is two and three times two which is six . | |
| 02:16 | And we're gonna add these two answers together . Two | |
| 02:18 | plus six equals eight For the last by her answer | |
| 02:22 | . Three times one . Well that's pretty easy . | |
| 02:25 | That's three . Our answer . 384 . Oh good | |
| 02:29 | . We'll go through a couple more examples . There | |
| 02:31 | is a bit of a complication with this and we'll | |
| 02:32 | have a bit of a look at that in this | |
| 02:34 | next question . Okay . There is a slight bit | |
| 02:36 | of our guess carrying across that you do have to | |
| 02:38 | do occasionally . So let's have a bit of a | |
| 02:40 | look at that with this particular example here , 46 | |
| 02:44 | times 14 . All right . How would you go | |
| 02:47 | about doing that ? So first off let's work out | |
| 02:49 | the units part . Okay , so six fours 24 | |
| 02:53 | . Now when I put this in , you're gonna | |
| 02:54 | see that I I'm not just going to write the | |
| 02:56 | entire 24 down . I'm gonna put the four down | |
| 02:58 | and I'm gonna put a little too up here just | |
| 03:00 | to tell me because it's too it's a 20 so | |
| 03:02 | it's part of the tens part . So it's gonna | |
| 03:03 | be the next part of our answer is gonna fall | |
| 03:05 | with that next part . So for our next part | |
| 03:08 | we have a one time to six and of four | |
| 03:10 | times before . So one times six is 64 times | |
| 03:13 | four is 16 . We're also going to be adding | |
| 03:17 | on our two as well . So six Plus 16 | |
| 03:20 | is 22 Plus two is 24 . You can guess | |
| 03:25 | that we're probably gonna carry across that to here as | |
| 03:27 | well to our hundreds part of the answer . And | |
| 03:29 | for our hundreds path we just multiply these last numbers | |
| 03:32 | here . Four times one is four plus two Is | |
| 03:37 | six . All right . One last question here . | |
| 03:40 | Well , I'm rubbing this out and we'll remember if | |
| 03:42 | you like this video , please hit the like button | |
| 03:45 | . Okay ? It does help us out when you | |
| 03:46 | do that . So , let's have a look at | |
| 03:48 | one last question here . Uh 57 times 82 . | |
| 03:54 | All right . We're not just going to go the | |
| 03:55 | easy numbers . Let's go for you the harder ones | |
| 03:57 | . All right . So , uh okay . First | |
| 04:00 | thing we get the unit seven times two is 14 | |
| 04:03 | . Okay . But the little one up there . | |
| 04:04 | Next thing we're gonna do is this rainbow bit of | |
| 04:06 | multiplication here . Okay , So 78 to 56 . | |
| 04:10 | We're gonna add that to Two times five , which | |
| 04:13 | is 10 . We're also going to add to that | |
| 04:14 | . This extra one here that we carried over . | |
| 04:16 | So 56 , 67 . All right . The very | |
| 04:22 | last part of what we have is 58-40 plus is | |
| 04:25 | six here we have this answer of 46 , So | |
| 04:32 | what did you think of that particular math tree ? | |
| 04:35 | Hopefully you liked it and please remember if you do | |
| 04:37 | like it , hit the like button . Do comment | |
| 04:40 | . Okay . There are other videos coming up there | |
| 04:42 | not just all gonna be math tricks . Okay ? | |
| 04:43 | So please remember they do like to subscribe and do | |
| 04:46 | become a patreon . Okay , Thank you for watching | |
| 04:49 | . See you next time boy . |
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