[(7 - 9)(3 - 5)]/(8 - 9) = ? Let’s do this math problem CORRECTLY!

How to simplify a numeric expression using the order of operations and positive and negative number rules.
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[@cdnmetelhead4013]

This reminds me of fighting with my sons math teacher. My son asked me for help with a problem he was struggling with. He showed me the method the teacher had taught. I couldn’t understand it either. I showed my son how I would do it. He was able to understand it in 5 minutes. I got a flame phone call from the teacher. He gave my son zero on his test even though he got all of the answers correct. He admonished me saying he had a bachelor’s level math courses. At the end of year interview I quietly mentioned that I had passed PhD level courses in Math.

[@linaD08]

Its all about ego. I had a similar experience myself in high school from a nun that prohibited everyone in the class for using my method for solving a math problem on our final exam.

[@linaD08]

I did it on my head and got -4. Key is to pay attention and track the signs. Love the challenges!!

[@Viola-nr2ft]

I got -4🙂 only because I needed to keep in mind the order of operations. I really enjoy your patiences in teachings❤.

[@vernahrris5601]

I had a teacher teach us without PEMDAS and it took me 35 years to undo that damage!

[@Karen_DNP]

@cdnmetelhead: Just wondering what this teacher said or what his expression looked like, when he heard of your PhD level of math training? As BA or BS math classes vs PhD level, would be like comparing apples to oranges, imho. Still, a great way to end his year + knock him down a few ego rungs of his math knowledge ladder🪜 😂😂😂

[@mingkee27]

Process parentheses first 7-9 >>> -2; 3-5 >>> -2; 8-9 >>> -1 Now process factor (-2)*(-2) >>> 2*2=4 Hence, 4/-1 = -4

[@vernahrris5601]

a negative times a positive is a negative!!!

[@vernahrris5601]

a negative divided by a positive is a negative

[@kerbe3]

Oh crap, I saw 8-9 as 9-8=1 oops.

[@anitawallace2166]

I GOT THE FIRST PART, BUT I HAVE NO MEMORY AT ALL OF HOW TO MULTIPLY AND DIVIDE WITH NEGATIVE NUMBERS.

[@susiet2150]

Correct

[@randallgreen4084]

My Granddaughter tells me that her teachers (middle school and high school) would use your videos to explain some concepts. I've been watching as I've not looked at much of this in 30 years and it is somewhat fun to try, especially if I got it right :)

[@RakkaSan7219]

I haven't done any math like this in over 29years and I just did it I. My head!!!! I k ow , NOT a BIG DEAL for ya but for me I'm Stoked!!!! I haven't had math from 7th grade until I got into college after 13yrs in military!! So Yes A BIG DEAL FOR ME!!!! YEAH ME!!!

[@randycarroll2885]

In high school and college, I wasn't the greatest in math. But at 65 years old. I can actually do this s*** in my head now. I do not know where the ability came from.

[@MeidasMJ]

I wish you were my math teacher at every grade level in school. I had so much anxiety over math that I just couldn’t function. I had a really hard time. Now it’s easy… or easier and it doesn’t induce panic attacks.

[@MeidasMJ]

I could have avoided 12 years of panic attacks .

[@danieldennis9831]

-4 parentheses first, then brackets then divide

[@bambiegabutin8271]

-4

[@BH-sn7ws]

I’m 80 years old and I have been enjoying going down the memory lane of math! I have always loved math until I met up with geometry, which I barely passed. I loved algebra! This has been very good for my brain! Keep them coming! 😊❤️

[@MeidasMJ]

Teachers are the most important part of learning math. One bad teacher set me back. And that occurred early. Very early. From that point on , I thought I couldn’t do math. That I was just too stupid. And every math class gave me severe anxiety.. I couldn’t learn. Then.. I had one good teacher that helped people with anxiety, and explained everything calmly and clearly. Now I realize that I can do math. It’s not panic attack inducing anymore. But it all started for me around 3rd grade when I had a teacher that wasn’t popular.. and made you feel stupid. It affected my math scores for the rest of my school career. Until I took some math courses at a community college to get up to speed. And I found out.. the teacher plays a huge part in whatever you are learning. Please keep teaching.

[@heatherbartusch5239]

Well I've put the work in , with your help, and I'm doing well....thank you Mr Math Man....😊❤

[@heqitao]

Nice. As a father with a young boy that I am trying to teach (and relearn myself) math to, these videos are very helpful. So far I have been bang on, but I know I'm going to learn a lot from this channel. tyvm! liked and subbed.

[@catherinewoodsellerbeckhor7560]

I am beginning to realise I was taught very well, even all these years later I remember the skills

[@TheMakersMarkTSF]

I am 57 and until starting to watch your videos about two weeks ago I would have got this wrong; but thanks to your videos I actually got it right. I am excited because this is the first one that I got right and it wasn't because of guessing! If I continue with this I will probably be able to help my grandchildren with math homework.

[@CarlosMartinez-ze7ty]

I’m 41 and haven’t had to do math like this in 30 years. I’m surprised on how much I got right on your videos but when I was young this did not compute to me at all! I was terrible in math. Funny how things come around and you remember what you couldn’t remember when it was important for a better grade! LOL

[@tinnitusnow1095]

I got it right!!!!! without watching the video. I used to hate math, but I recently had a great math teacher and I now find this stuff easy. :)

[@annettegollon239]

Answer is -4. Have a great day John.😎😎

[@bruss529]

This one was easier than most previous expressions.

[@leonardsolis412]

I got it right thanks to you refreshing my memory a while back.

[@MeidasMJ]

Some people were born to teach. You’re one of them

[@tytn9978]

I am quite pleased to receive a happy face and a star ... it took me less than 10 seconds to "solve" this one!

[@joyona7430]

Thank you : )!

[@marilynworth997]

Surprisingly, I'm enjoying your KZbin tidbits. I hated math in school, and of course, I didn't do too well in it. Now, at 77, I have no need to learn any math, but I find I want to - now that I don't have to pass any tests, etc. I certainly have no need to take your courses -- but how fun it would be to get a daily email from you with a KZbin style problem and maybe 4 or so practice problems - as a kind of yearly subscription, starting with basic math and moving up the chain. You could allow people to start at any level or return to any level for a yearly subscription. Just a thought.

[@debbiewareing1178]

I have to admit this is slightly beyond my knowledge of maths. Not watched the video yet, but my inclination is to sort out the parentheses in the internal bracket first. Then simply what is in the outer bracket and divide the first parenthesis with the second. Not able to do it mentally as I would normally, but I shall now check the solution.

[@Butterflies-are-free]

Yay! 🌟 Got it! 😁

[@belkacemtalhadjt3868]

Great teacher . The way you teach can make the deaf understand.

[@kjellg6532]

That is, if you do not fall asleep.

[@Q_coli1]

Thanks very much

[@conniej2691]

I got it right! Yea!

[@jeromebuenoval7476]

-4 Using PEMDAS right P inner to outer ( ) removed [(7-9)(3-5)]÷(8-9) V / F 7×3=21 O 7×-5=35 I -9×3=-27 L -9×-5=45 ------ 4 ÷ (8-9) \ / 4 ÷ -1 MD=p left to right (=p means equal precedence) 4÷-1=-4 AS left to right none Answer is -4

[@chetanjoshi2159]

Thanks

[@cobbler88]

I like seeimg all the people writing thst they wished they taught it this way when they were in school. I'm almost 53. This is exactly how we were taught in the 70s and 80s - at leasy where i grew up. To be honest, i can't really imagine it being taght any other way and expect anyone to learn it.

[@Glicksman1]

I go it before watching the vid. Good for me.

[@loracehooker3036]

Explain why it would not be 7-- +9, why change the operation of an obvious subtract symbol?

[@enriqueiii9209]

(7 - 9) = -2, if the first number is smaller than the second number it's negative.

[@remessinger]

-4? BTW, I figured it out, because of the video I saw of yours a few days ago. Then I remember the acronym FOIL. I paused the video for a moment and got the right answer. I don't recall any teacher explaining the order of operations before you. I wish they would have. I would have been better at math than I am now.

[@timothygreen9884]

Im a carpenter , mason, definitely not a academic I just came up with 4 ,… I would have said -4 if I knew that was possible but I’m not that smart ,so

[@terrifoster8986]

I must be learning something because I got it right!!! 😂

[@leetrask6042]

I'm going to use my sliderule.

[@kjellg6532]

Hm, and how do you insert signs? ;)

[@fyrekrystaal27]

I was reviewing math at Kahn Academy and was wanting to throw my computer because it was trying to teach me the new math. Personally I think new math my kids learned in school was confusing. I also got the answer of -4

[@user-rb6hb7rw5z]

Good

[@marymurphy937]

Ans --4.

[@vernahrris5601]

Yeah, I got this correct without a calculator!!!!

[@tophat593]

Wanted to take a guess but I've no idea what square brackets mean. Well at I guess I'll learn something

[@nickclopton7986]

Square brackets means that whatever is inside of them has to be done first. Same with Parthisies.

[@tophat593]

@@nickclopton7986 Thanks. I would have written two normal brackets, I guess the shape change is for clarity.

[@brendaryan306]

Maybe I'm too real life but how did a -4 suddently become a +4?

[@SimplyBeautiful516]

I think He forgot to explain that a negative number multiplied by another negative number is always a positive number.

[@francismnyele]

I would have thought that PEMDAS requires me to do the big brackets first?!

[@homebakedgoodies]

Done w/o writing

[@lcmayzl]

Negative 4 is what I got.

[@jmflournoy386]

Use RPN and avoid the ambiguity

[@JohnBarron-cd1lp]

So, in what real world situation is this math problem used?

[@Bedgie01]

to screw with peoples minds that all

[@JohnBarron-cd1lp]

@@Bedgie01 - Problems such as these do establish aptitude…on a sliding scale, but to say calculators can’t be used to solve them is short sighted and foolish.

[@rezotydnic]

Please explain why -2×-2=+4

[@ashleyedwards5403]

-4

[@duggydugg3937]

4/-1

[@lacynylons6317]

-4/1 = -4

[@Viola-nr2ft]

However i didnt follow some of the steps 😢. I will keeping trying thou 🎉

[@SpideyVids]

The answer is -4 and it only took a few seconds to do it in my head.

[@ICU2B4UDO]

-4...

[@davidcarter6491]

Yay!!!🎉😢😮😮😊

[@jokesprang8204]

i am from the Netherlands

[@timwee4820]

Do these weird equations mean anything in real life?

[@kjellg6532]

Probably not exact this excample, but the principals are there also in everyday math. This is a training example to sharpen your skills.

[@yogidemis8513]

286,538 r375. Next!

[@mcsmith732]

Negative numbers always throw me. But I ended up with 4. Aaaaaaaaaaaand I was wrong! I didn't get the negative part. So I will pay very close attention to your explanation. Hopefully, it will clear some things up for me. Thanks for helping us poor sods out with these. They're kind of fun, now that I don't have to worry about tests and grades anymore. I'm 70 years old and now have the time to explore some of things that I never quite understood throughout my lifetime.

[@bobcornwell403]

I ended up with - 4.

[@nickclopton7986]

The answer is -4. Order of operations, or Pemdos, or Please excuse my dear ant, Sally. Exponents first. Then. Parentheses, then Multiplication. and Division, in whatever order they come in. So of Multiplication came first or is left of division you would do multiplication first. Lastly, you do addition and subtraction.

[@RangerCaptain11A]

important to do work from left to right when you have several of the same level of operations.

[@nickclopton7986]

@@RangerCaptain11A That depends. if you have addition or subtraction only that would be correct. But if you have Multiplication, Division, and Addition as an example the Divison or multiplication would need to be completed first.

[@John_Wall]

​@@nickclopton7986Nick, you're correct but so is RangerCaptain. They stated that you "work from left to right when you have several of the same level of operations". In other words, they're saying that you would work through any multiplication and/or division left to right first, before moving onto the next level of order of operations, that being addition and/or subtraction, again working left to right.

[@Jack-pm1ve]

I'm sorry but I learned this stuff in grade school in the late sixties along with cursive writing

[@williamlynch1929]

-4!

[@cris1596]

Wasn't -2 . -2 = 4 / - 1 = - 4

[@belkacemtalhadjt3868]

I got -4 all of sudden

[@annamarynemecek7992]

3

[@harrymatabal8448]

Ok -4

[@Truth845]

-4 did use calc at the end😏

[@Carolmaizy]

Yessss! -4! Right? Right?

[@Teams-ex7rd]

-4 -2*-2=4- -1=-4

[@jonathank4278]

I am not good with negative numbers. 1:57

[@anestismoutafidis529]

=> 4/-1= -4, or 4i

[@marcusroberts7624]

-4, Mm-Kay.

[@mbschmez]

what math problem i just see a bunch of random numbers separated by language symbols

[@g.n.4046]

I don't understand how -2 x -2 = 4 ? If 2 x 2 = 4 how can -2 x -2 be the same ? I "googled" the question "why is a negative multiplied by a negative positive?" ...the place it took me gave such a long complicated answer - I couldn't understand it... So....maybe someone will be able to explain it to me easier.... How can -2 x -2 be the same as +2 x +2 ??

[@Bedgie01]

A gambler loses $2 per day. How much more money did they have 2 days ago? -2 x-2= Here, (the loss per day is one negative) and (going backwards in time is another negative). (-$2) x (-2days) = $4 is what he/her/they/them/it or whatever they decide to be called these days started with 2 days ago.

[@thenetsurferboy]

Minus x minus give a + Simple

[@g.n.4046]

@@thenetsurferboy I know that's the rule ....but make it make sense. Why is it the rule ? if 2 x 2 = 4 ... how can -2 x -2 = 4 ? -2 and +2 are not the same...

[@thenetsurferboy]

It is the basis of maths Also - x + gives a minus@@g.n.4046

[@ronnieq9706]

The answer is either -31 or -4.

[@batavuskoga]

I don't see a problem with this exercise. You can't give a wrong answer here even when (7-9)(3-5)/(8-9) was given without [ ].

[@manubhatt2450]

-1

[@jonathank4278]

Why is it +4? 9:10

[@jonathank4278]

I don't care about Subscribing anymore. I just want to get to the main part of the video. 8:53

[@davidduran2195]

Answer is -4

[@MUNAYESHOMEREMEDY]

(-2)(-2) / -1 = -4

[@thehellyousay]

-4. I'm probably wrong. MWAHAHAHAHAHAHAHA ... cough, cough, choke, gasp wheeze ...

[@jokesprang8204]

-4 , i am 76 years old.

[@TomBrown-ij3jk]

I’m 78 years old and I got it right ! That won’t happen again😂

[@bettystecher6372]

2

[@donnaallen5295]

-2

[@donnaallen5295]

-4

[@RaceAgnstTme]

-4. Let’s see. Edited:Yeaaa 😂😂😂

[@jonathank4278]

0 or 1

[@markofsatan9617]

If you only want to know the way to solve this skip to 2:20

[@stevea5282]

I solved in 5 sec but had wrong answer lol +4

[@michellemorgan205]

the answer is -4

[@raleighparker7046]

GEMS…… -4.0

[@richdeering9580]

My calculator says -2 x -2 = -4…… ????

[@davidshahin9753]

10 minutes 2 solve this?

[@MJ-we9vu]

No, 10 minutes to explain how to solve this.

[@jackmiles4443]

It's -4

[@denisecaringer4726]

I got it right, and I hate math. It must have been an easy one.

[@fredsmith6679]

It may have been an easy one but I bet 80% of the population couldn’t work it out in their heads

[@cynthiajacklyn6639]

Oh no, I was wrong!! 😮😢 I didn't divide, what was I thinking?!?!

[@nikjames2965]

The answer is -4... It took me 15 seconds without paper or a calculator (heaven forbid)... I am 76.... not a challenge. Anybody who bets this wrong should not apply for a job with NASA - not even as a janitor

[@cynthiajacklyn6639]

-1 final answer lol