Can you solve this tricky math crossword? - Free Educational videos for Students in K-12

Can you solve this tricky math crossword? - By tecmath

Transcript


00:0-1	Good day . Welcome to Tech Mouth channel . I'm
00:02	josh , Well , here's today's problem and it's pretty
00:04	self explanatory . It's a crossword . So a couple
00:07	of conditions do apply . We're going to be using
00:10	the numbers one through nine to put into the blank
00:12	spaces here to make these equations correct and the order
00:16	of operations do not apply for these equations . So
00:19	this number plus this number divided by this number will
00:22	give us the answer of two . For example .
00:24	So pause this video . If you'd like to give
00:26	his problem to try and when you're ready to see
00:28	the solution and see how I solved it started up
00:30	again . Yeah . So time's up all done .
00:48	Maybe that was easy or maybe you had a few
00:50	are crosswords what you did this by the way ,
00:53	I know it's a terrible joke , but that sort
00:54	of leads into what I'm gonna be asking . I'm
00:56	gonna be chasing down the world's best math jokes ,
00:59	uh , maybe the world's worst math jokes , depending
01:01	on your point of view . So if you have
01:03	any of these , can you please put them in
01:04	the comments ? That would be great . I'll go
01:06	through a few of these after the solution , but
01:08	I want your ones anyway , So let's go through
01:11	the solution here . First thing I did is I
01:13	figured I was going to be looking at one of
01:15	the equations that had either multiplication or division in them
01:19	because these have a whole lot more limited numbers that
01:21	you can put in them . So we have this
01:23	equation here . This multiplied by this , divided by
01:25	this equals to this equation here where we have a
01:28	division and this equation here where we have this multiplication
01:31	here and I ended up starting with this particular equation
01:35	here , you're going to notice that we've got a
01:37	number that we're going to multiply by this number to
01:39	get seven . So you're going to see that the
01:41	only numbers that we can multiply to get seven are
01:43	going to be one and seven . So either this
01:46	number minus this number equals one or this number minus
01:50	. This number equals seven and this will be a
01:52	one or a seven . So which way is it
01:54	going to be ? Well , if we have a
01:56	look at this equation here , it gives us a
01:58	bit of a hint because this number multiplied by this
02:02	number plus this number equals 22 . If this is
02:05	a one we can't multiply by any number . Even
02:08	if we multiply by nine , it's not going to
02:10	be big enough to actually then add to another number
02:13	two , equal 22 . This would be one times
02:15	nine , which would equal nine plus eight would still
02:18	be too short . So this number here has to
02:20	be the seven . Okay , so what now So
02:23	now I went to this equation here now , let's
02:26	consider the different numbers . It could go in here
02:28	seven times 17 times one is seven . But this
02:31	number here can not be big enough to make the
02:34	answer 22 . So that answer can't be won seven
02:37	times two . Well , that's okay . Seven times
02:39	two is 14 . So we could go seven times
02:42	to which article 14 . And that would make this
02:44	number here have to be an eight and that would
02:46	work Okay . We could also get seven times three
02:49	. That would work seven times three is 21 .
02:52	And this then would have to be a one .
02:54	We couldn't go to seven fours because seven forces 28
02:57	too big . The numbers that are going to go
02:59	in here are either going to be a two or
03:01	three and then eight or one that's going to go
03:03	in here , so which one is it ? Well
03:05	, we can work that out through a bit of
03:07	logic here . If we consider this number was a
03:09	one here , it would mean that these two numbers
03:11	here would have to have a difference . That would
03:14	be equal to 12 . This number minus this number
03:17	would be equal to 12 . You're going to say
03:19	, hey , they actually can't occur because we don't
03:21	have numbers that are big enough here for that to
03:23	occur . So this number here cannot be a one
03:25	. So therefore we have to have this number here
03:29	being the eight . So let's put it in .
03:31	This would have to be the eight and this number
03:33	here would have to be the two and we've got
03:36	now three and now we have three numbers in our
03:38	equation here , we have 72 and eight . So
03:41	how do we go through and solve the next part
03:44	? Well , if we consider now this equation here
03:47	, we're looking for a number that advised by two
03:49	to give us two , it would mean that we
03:51	have to have these two numbers here adding up To
03:54	well four because 4 divided by two is equal to
03:58	two . So in here we only have two possibilities
04:02	that add up to four . That is going to
04:03	be the numbers of three and one . So let's
04:06	put that equation to the side for a minute and
04:08	come back to it . And I'm now going to
04:09	have a look at this equation here . We know
04:12	that this equation here . These two numbers have to
04:15	have a difference of five . This number - This
04:17	number has to work or five because then we add
04:19	eight to it and get 13 . So what numbers
04:22	could we have now ? We have a whole bunch
04:24	of numbers that are accounted for at the moment .
04:26	Let's drop them down . We have the following numbers
04:29	which are accounted for . We have seven , we
04:31	have to we have eight and we also have one
04:35	and we have three . So let's have a look
04:37	at what numbers we could put a difference of five
04:40	hearing first ones we could do is we could say
04:42	we could use the numbers nine and four . They
04:45	have a difference of five . So this could be
04:46	nine and this could be four . We could use
04:49	eight and three but that's can't be used because that's
04:51	already been used . We can't use seven and to
04:54	those guys have already been used we can't use six
04:56	and one because we've used the one down here .
04:59	So these numbers here have to be nine and four
05:01	. This has to be a nine and this has
05:04	to be a four . They're the only ones left
05:06	that actually fit the bill . So we've got our
05:08	numbers here . So now how can we solve this
05:11	particular part here ? Well we know that this part
05:13	here has to be a three or a one ,
05:16	but this can't be the one here because this would
05:18	have to be an 18 , 18 . Times one
05:20	divided by nine equals two , can't be it .
05:23	So this number here would have to be the three
05:26	and this number here has to be the one .
05:28	What numbers do we have left ? Well what number
05:31	do we multiply by three to get 18 ? Because
05:34	18 divided by nine equals to that would be six
05:37	there . You know , we've got that number here
05:39	and six minus what number times seven equals seven ,
05:44	so six minus five because that's a one and that
05:47	would have to be one times seven equals seven .
05:51	Lets us check this here . Five plus one equals
05:53	six minus four equals two . And there you go
05:56	. The crosswords been solved . How'd you like that
05:58	? All right . Did you go okay with that
06:00	one ? Did you do it differently ? Maybe you
06:01	did it better than I did or faster . I
06:04	am going to expect at least one comment that says
06:07	I just randomly put the numbers in and got it
06:08	straight away . I don't even know what you're talking
06:10	about . So , I'd really love to see that
06:12	particular comment and I expect to see a whole bunch
06:14	of thumbs up with that as well . So anyway
06:16	, my particular math jokes that we're going to have
06:19	. First off , we have that all this time
06:21	. Never a crossword . What about this one ?
06:23	When somebody's saying they're cold , you say to the
06:24	mate go stand in the corner . It's 90 degrees
06:27	there , 90 degrees , 90 degrees in the corner
06:31	. Not a Bad one . What about we talk
06:34	about two parallel lines where they had so much in
06:36	common . They were going the same direction . But
06:39	tragically they never met . Yeah . Anyway , what
06:43	I would like is I would like your best math
06:46	dad jokes . I don't want to be coming out
06:48	with these in a few videos . I want to
06:49	chuck these in as much as I can because I
06:51	think they're awfully good or Goodly awful . I don't
06:53	know what it is . Anyway , if you like
06:54	this video , please give me a thumbs up and
06:56	a big shout out to my subscribers and my patrons
06:59	and we'll see you next time . Stay well and
07:01	stay safe . So you think boy .

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