3.OA.6 - Meaning of Division (Singapore Math) - Free Educational videos for Students in K-12 | Lumos Learning

3.OA.6 - Meaning of Division (Singapore Math) - Free Educational videos for Students in k-12


3.OA.6 - Meaning of Division (Singapore Math) - By MathwithMrAlmeda



Transcript
00:0-1 Welcome back , mathematicians to math with Mr Almeida today
00:04 we're gonna be talking about division . And when we
00:09 talk about division , you might be wondering why ,
00:12 If we're talking about division , you actually see a
00:15 multiplication problem right here . And it's an interesting question
00:19 that you ask . But today I'm going to explain
00:22 to you what really division is all about , because
00:25 once you understand what multiplication is about , then you
00:28 truly understand what division is all about . So I'm
00:31 gonna start with multiplication . Um , you've basically seen
00:34 this fact before For times eight is equal to 32
00:40 . Um , that means four times a is 32
00:43 . So I'm going to get here and actually call
00:48 the I'm gonna name the names that we call numbers
00:52 that we used to multiply . So for is a
00:55 number that we're that we're using to multiply and eight
00:59 is the number that we're using to multiply as well
01:02 . The numbers that we use to multiply are actually
01:05 called factors factors and a factor is a number that
01:14 is used to multiply . So we can say that
01:18 for is a factor and eight is a factor and
01:22 they produce . They make ah product of third of
01:27 32 . So the answer we get after we multiply
01:30 is called the product . It's called the product .
01:34 So we have for is a factor and a is
01:38 a factor . Both the factors four and eight ,
01:41 um , when multiplied by each other , make a
01:46 product of 32 . So again , I just want
01:48 to focus on this word factor . Because once you
01:50 understand what a factor is , it makes your world
01:53 a whole lot easier when it comes to division .
01:55 So once again , in multiplication , um , the
01:59 four is a factor , and the eight is a
02:02 factor . Um , when I multiply the factors together
02:06 , I get a product of 32 . So four
02:09 times eight is 32 4 and eight are factors .
02:12 Um , in this problem , once you understand that
02:16 and you know your basic multiplication fax , like four
02:19 times 8 . 30 to 5 times four is 26
02:24 times nine is 54 . Once you know those basic
02:28 fax , um , then we can actually move forward
02:32 . Uh , let me just write this down again
02:33 . So we have six times nine equals 54 .
02:40 And so we're saying that six is a factor and
02:44 nine is a factor and they're making a product of
02:48 54 . So both six and nine are both factors
02:56 , so that's a factor . And this is a
02:58 factor as well . Six is a factor and nine
03:01 is a factor . One more problem , Uh ,
03:03 two times seven Now to is a factor and seven
03:10 is a factor as well . I think you get
03:12 the point . I'm not going to spend too much
03:14 time on that because I think it speaks for itself
03:17 . And if you need to go back , you
03:19 can always rewind the video to go back . However
03:22 , now , once we understand what factors are and
03:25 we know a multiplication problem is just multiplying factors .
03:28 Now we can move on to division division . Um
03:37 , you've been told that division has something to do
03:39 with multiplication , but I'm gonna make it so clear
03:42 for you . Toe . Explain to you what division
03:44 is Division is simply an unknown factor problem . That's
03:50 all it iss . So you know what ? You're
03:53 going to get it the end . You're just trying
03:55 to find some number to multiply by another number to
03:59 get a certain number . That's what division is .
04:02 So you've been asked in the past to find 32
04:04 divided by eight . Basically , what this is saying
04:08 is we want to find a number that when we
04:13 multiply by eight , we get 32 . So 32
04:19 divided by eight can also be thought of as an
04:22 unknown factor problem . By thinking about it this way
04:25 , you can say eight times what number equals 32
04:33 eight times what number equals 30 to what we know
04:36 . That eight times four is 32 . So essentially
04:40 , that is all we're being asked to do .
04:41 We're being asked to find the unknown factor . That's
04:45 what a division problem is . So when you see
04:47 32 divided by eight , you're really being asked eight
04:51 times what number gives me 32 eight times what number
04:58 gives me 32 . And the answer to that question
05:01 is four . So that's why 32 divided by eight
05:05 is four . Let me give you another example .
05:10 So when you when you see this division problem ,
05:13 say , for example , you have , uh ,
05:17 40 divided by five , you're really being asked what
05:29 problem ? Five times what number equals 40 right ,
05:38 five times what number equals 40 . And in fact
05:41 , let me get rid of this equal sign .
05:43 I misused it . Me ? Just erase this .
05:49 Okay ? What you're really being asked is go back
05:57 to the pen . Okay , so we have 40
06:00 . Divided by five is really asking you five times
06:03 what number equals 40 . Or you can rewrite it
06:10 . The way you see it , you can say
06:12 five times What number gives you 40 . And the
06:15 answer to that ? The missing factor that we multiply
06:19 five by is eight . And that's why the answer
06:23 to 40 divided by five is eight . So we
06:26 have five times eight is equal to 40 . So
06:30 when you see a division problem , it's really an
06:33 unknown factor . Problem ? All you really have to
06:36 memorize are your multiple . You really have to know
06:39 . Here are your multiplication fax to solve the vision
06:42 problems . For example , if you see this problem
06:45 here might say four times what number equals 12 .
06:51 Well , this looks like this looks like it's a
06:54 multiplication problem , but it's not because what am I
06:57 missing ? I'm missing a factor . So because I'm
07:00 missing a factor , I am missing a factor .
07:08 This is a division problem . So what I'm really
07:12 being asked is four times what number equals 12 and
07:16 the and the missing factor is three . So written
07:20 a different way . The question could have been asked
07:23 . 12 divided by four equals What number ? Basically
07:29 , what you would say issue would say four times
07:32 . What number gives me a product of 12 ?
07:36 And the answer to that is three . And that's
07:38 why 12 Divided by forest three . Let me give
07:41 you one more division problem . Let's choose different colleges
07:45 for fun here . So we have 24 divided by
07:55 four is equal to what ? So basically all you
08:02 have to ask yourself this . Say what number I
08:04 have to find the number that makes 24 when multiplied
08:08 by four . What number do I multiply four by
08:12 to get 24 ? Well , the answer is six
08:16 . So again , going back to this , all
08:18 you really have to know are your multiplication fax .
08:22 And if you know them clearly , division is going
08:25 to really be very simple for you all you're being
08:29 asked and this is the way to look at it
08:32 . This first number is what you're trying to get
08:34 to . You're basically looking at this number to the
08:38 right of the division sign and saying , What number
08:41 do I have to multiply ? This This number by
08:43 to get this number . What number do I have
08:46 to multiply the five by to get 40 and the
08:50 answers ? Eight . What number do I have to
08:51 multiply the four by to get 12 f Multiply four
08:55 by three . And what number do I have to
08:57 multiply four by to get 24 I have to multiply
09:01 four times six . So thinking about it that way
09:04 will really help you to understand what division is again
09:07 . Division is just unknown . Factor Problem when you
09:10 walk away from this video , if you can repeat
09:12 to yourself three times , division is just an unknown
09:15 factor . Problem division is just an unknown factor .
09:19 Problem division is just an unknown factor problem . You
09:23 will walk away understanding what division is with whole numbers
09:27 . Help you enjoy and continue your journey with mathematics
00:0-1 .
Summarizer

DESCRIPTION:

Mr. Almeida explains the meaning of division as an "unknown factor problem." This illustrates 3.OA.6 in the grade 3 Common Core Standards for Mathematics.

OVERVIEW:

3.OA.6 - Meaning of Division (Singapore Math) is a free educational video by MathwithMrAlmeda.It helps students in grades 3 practice the following standards 3.OA.B.6.

This page not only allows students and teachers view 3.OA.6 - Meaning of Division (Singapore Math) but also find engaging Sample Questions, Apps, Pins, Worksheets, Books related to the following topics.

1. 3.OA.B.6 : Understand division as an unknown-factor problem. For example, divide 32 ÷ 8 by finding the number that makes 32 when multiplied by 8. .


GRADES:

3


STANDARDS:

3.OA.B.6

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