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. .