Lattice Multiplication - By tecmath
Transcript
| 00:0-1 | Good day and welcome to the Tech Math channel . | |
| 00:01 | What we're looking at today's video is how to multiply | |
| 00:04 | any two types of numbers with one another . So | |
| 00:06 | any type , any three digit by two digit or | |
| 00:09 | a four digit by a three digit number . We're | |
| 00:11 | going to have a look at these and look at | |
| 00:13 | a different way of doing this . I've been looking | |
| 00:14 | at this sort of thing in previous videos and I'm | |
| 00:16 | gonna put a link up right now . There you | |
| 00:18 | go there . Um , on different ways I do | |
| 00:20 | this . But today it's going to be a bit | |
| 00:22 | different because I'm looking at this using our boxes and | |
| 00:25 | basically a little table . Very easy table to draw | |
| 00:27 | and an easy way of doing this just in case | |
| 00:29 | it might be a different way you prefer doing . | |
| 00:31 | So without much further ado , let's work out 324 | |
| 00:36 | times 15 . So , how do we work this | |
| 00:41 | out now ? That's what I said to do this | |
| 00:43 | . I'm gonna be using these boxes now , we're | |
| 00:46 | gonna need a table which is going to be three | |
| 00:49 | boxes . What's more boxes ? Okay , so draw | |
| 00:54 | this Here right now , there's my two by three | |
| 00:59 | . And the other thing you draw on these tables | |
| 01:00 | are these diving online , sloping down to the left | |
| 01:03 | . It's very important . I think with this also | |
| 01:05 | try to be as neat as you can . Otherwise | |
| 01:09 | you're getting all sorts of troubles with math when you're | |
| 01:10 | not , you're not being needed . You probably realize | |
| 01:12 | . So 324 times 15 and how I'm gonna do | |
| 01:19 | this is only go three times 12 times 14 times | |
| 01:23 | 13 times 52 times five and four times five . | |
| 01:27 | I'm going to write the answers to each of these | |
| 01:29 | questions . So the tens go in this part and | |
| 01:32 | the unit's going this part . So three times one | |
| 01:34 | is three , two times 1 is 2 . 1 | |
| 01:39 | times four is 4 , three times five is 15 | |
| 01:43 | , 5 times two is 10 and five times four | |
| 01:47 | is 20 . There you go . Already got the | |
| 01:48 | answers now . How do I get my final answer | |
| 01:51 | ? Well , I just start adding up in this | |
| 01:52 | diagonal direction , so let's have a look . Nothing | |
| 01:55 | and nothing . There's nothing . Four plus two is | |
| 01:58 | 65 plus one , plus two is eight and four | |
| 02:02 | plus three plus one is four . There you go | |
| 02:06 | . That's the answer . That's pretty cool . Right | |
| 02:08 | , we can do this with bigger numbers , I'll | |
| 02:10 | put a bigger one up right now . Okay , | |
| 02:13 | so let's do uh 1342 , and We'll Times Act | |
| 02:19 | by 600 , Okay , so we're gonna need a | |
| 02:27 | box . How big ? That's right , three x | |
| 02:29 | 4 . So let's draw that in . Oh , | |
| 02:32 | here's the box . Which is gonna have to fit | |
| 02:37 | three rose and for columns and these diagonal lines sloping | |
| 02:46 | down once again , so . Mhm . All right | |
| 02:51 | . In a question which is 13 42 times 643 | |
| 03:01 | . And I'll start putting in my answers now . | |
| 03:03 | 162663 18 , 64 24 to 6 to 12 . | |
| 03:11 | Okay . Next next row , 14 is 443 12 | |
| 03:17 | , 4 , 4 - 16 . 4 to 8 | |
| 03:21 | . Okay . Next 113 is 33 threes and 934 | |
| 03:26 | 12 and 3 to 6 . Now we can start | |
| 03:30 | adding these up diagonally . Okay , we have a | |
| 03:32 | 62 plus eight is 10 , carry the one 10 | |
| 03:37 | , so one plus 9 is 10 , 11 , | |
| 03:40 | 17 , 19 . Okay , carry the one . | |
| 03:44 | One plus three is 467 11 , 12 carry the | |
| 03:51 | one , one plus four is 56 one plus four | |
| 03:57 | is 56 14 , 16 carry the one and six | |
| 04:03 | plus one is seven plus . This one here is | |
| 04:05 | so answer is 862906 . That's pretty easy . Right | |
| 04:13 | ? It's a really , really good method . I | |
| 04:15 | really , really like this method as well , tend | |
| 04:17 | to use a slightly different way . I think the | |
| 04:18 | bigger numbers actually in some ways prefer this method . | |
| 04:21 | I think it's a nice simple cut and dry sort | |
| 04:24 | of one , especially for kids and that sort of | |
| 04:26 | deal . It's a really good way also of getting | |
| 04:27 | to practice their times tables . It's a good one | |
| 04:30 | . Also , if you don't buy juggling so many | |
| 04:31 | numbers necessarily in your head at once . Okay , | |
| 04:35 | hopefully you like that method and you might give it | |
| 04:37 | a bit of a shot . We'll see you next | |
| 04:40 | time . |
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Lattice Multiplication is a free educational video by tecmath.
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