Multiplying by multiples of 10, 100, and 1,000. - By tecmath
Transcript
| 00:0-1 | Today and welcome to the tech mouth channel we're going | |
| 00:02 | to have a look at in this video is how | |
| 00:03 | to multiply by multiples of 10 . This means multiplying | |
| 00:07 | by hundreds , thousands , tens of millions . Alright | |
| 00:11 | , maybe you're really , really good at these . | |
| 00:12 | We'll see by the end of this video . I | |
| 00:14 | think you should be an absolute a look . All | |
| 00:18 | right . What about say something like 26 times 100 | |
| 00:24 | . How would you get the answer to that ? | |
| 00:26 | Well , these aren't really that bad , but there's | |
| 00:28 | a little trick with us and this is the way | |
| 00:30 | I do these . First off , I count the | |
| 00:33 | number of zeros on this particular number here . The | |
| 00:36 | one with the tens based one , which is this | |
| 00:39 | ? So there's 120 is there ? And I get | |
| 00:41 | my 26 And there's a decimal place after this . | |
| 00:45 | 26 . You can't see it . We don't often | |
| 00:47 | draw it in but it's there and we have to | |
| 00:49 | move it . We have to move the decimal place | |
| 00:52 | . That's what we're doing . Whenever it's time to | |
| 00:54 | buy tens or hundreds of thousands were just moving this | |
| 00:57 | decimal place , 26 itself will stay the same . | |
| 01:01 | So we're going to move this decimal place and we're | |
| 01:03 | gonna end up with the moral zeros . Um , | |
| 01:07 | how many times we're going to move it ? Well | |
| 01:09 | , we crossed out 12 zeros here . That's how | |
| 01:11 | many times we're going to move it . Okay . | |
| 01:14 | To zeros we're going to jump two times . So | |
| 01:16 | one two . Okay . That's one place is going | |
| 01:20 | to end up here . What we draw underneath or | |
| 01:23 | above the , sorry , above these particular little jumps | |
| 01:26 | is we put zeros there . Okay . And we | |
| 01:30 | get the answer of 2000 600 . Pretty easy . | |
| 01:36 | Right , I'll give you one more of these . | |
| 01:38 | Mm hmm . We'll get rid of that . And | |
| 01:41 | the next one will do is say something like 33 | |
| 01:45 | . What about 350 times 1000 ? Okay , so | |
| 01:52 | first off , let's have a look how many zeros | |
| 01:53 | as , as 123 zeros . We're going to have | |
| 01:57 | to move this number is getting bigger as we're times | |
| 02:00 | again . We're going to have to move three times | |
| 02:04 | three Zeros . So all right down by 350 . | |
| 02:09 | Yeah . Where the decimal places just here and I | |
| 02:12 | move the number 12 three times and above these . | |
| 02:17 | I put my zeros . So my answer . 350 | |
| 02:25 | 1000 . Okay , I'll get one more of these | |
| 02:31 | And this one is going to be a bit of | |
| 02:32 | a tricky one . Okay , this one I'm going | |
| 02:36 | to put a decimal place already in the number . | |
| 02:38 | So what about I do say something like 3.75 and | |
| 02:44 | I'm going to times this by 1000 . Okay . | |
| 02:49 | So let's count the number of zeros in this particular | |
| 02:53 | thing where timing by there is 123 zeros . Okay | |
| 02:58 | . Okay . Because we're timing the numbers getting bigger | |
| 03:00 | , the decimal place is going to move this way | |
| 03:03 | . It's going to move three times this way . | |
| 03:05 | So 3.75 decimal place . Alright , actually rewrite 3775 | |
| 03:10 | to get myself into space here . The decimal place | |
| 03:12 | is going to move one two three times . And | |
| 03:17 | what we're gonna do is we're going to end up | |
| 03:19 | with a zero in here . So the answer we | |
| 03:21 | get is 3700 and 50 . Here's a few questions | |
| 03:28 | for you to practice boy . See here you go | |
| 03:31 | on them . So here's the questions . All right | |
| 03:36 | . I recommend you pauses and I want to go | |
| 03:37 | through the answers in five seconds . So 54 three | |
| 03:43 | two one . All right , so how do you | |
| 03:47 | go with those ? Okay , let's have a look | |
| 03:49 | . So We've got two zeros on this one here | |
| 03:54 | . So we're going to move the decimal place on | |
| 03:56 | the 6 52 times . So 6 50 I'm gonna | |
| 04:00 | move it 12 times . The answer is 65,000 . | |
| 04:05 | This one we got 30 as a decimal places . | |
| 04:08 | Gonna have to jump three times . So 45 123 | |
| 04:15 | 45,000 . The answer this one we have 123 decimal | |
| 04:19 | places . So decimal place . So the decimal place | |
| 04:23 | is going to jump three times . 123 Yes , | |
| 04:27 | This one got 10 . So we're going to move | |
| 04:30 | the decimal place one time . So 9.6 I have | |
| 04:34 | to move it once . Okay , so there's some | |
| 04:37 | places getting up here . My answer is going to | |
| 04:39 | be 96 . This one here , I've got 12 | |
| 04:43 | decimal 20 So I have to move the decimal place | |
| 04:45 | twice . So 3.7 point 375 I'll have to move | |
| 04:50 | the decimal place 12 times . Decimal place is gonna | |
| 04:53 | end up here at 7 37 . This one here | |
| 05:00 | I'm moving the decimal place once . Should end up | |
| 05:03 | here . Getting 74.2 . This one a bit of | |
| 05:09 | a trick one to put in . Put into the | |
| 05:11 | end here . I'm going to move the decimal place | |
| 05:13 | 123 times . So let's do that . 123 . | |
| 05:19 | The answer shoes . 12 . Okay . Hopefully went | |
| 05:24 | really , really good with those . Any questions don't | |
| 05:26 | fail to ask . You'll always be able to ask | |
| 05:29 | and I'll always give you help as soon as I | |
| 05:31 | can get back to you . Okay ? See you | |
| 05:33 | next time . |
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Multiplying by multiples of 10, 100, and 1,000. is a free educational video by tecmath.
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