Multiplying and dividing negative numbers

[OrigamiSenseH]

Thanks

[CalebTaylor26]

i hate science

[deadbones97]

Thanks so much maaaaaaannnn!

[Lillybellscute]

OMG thx this made it so easy! :)

[futrefusions]

You are awesome!!!!!

[SasukexNarutoxYaoi]

thx. ! you rlly helped. ! ((:

[cool248dj]

12 people dont know what school is

[cool248dj]

i found 6 faces =D =D :l :l :l :l at 3:50

[QisX0X0]

Thank you for helping me :D

[NiallBeag]

The confusion of the commutative and transitive properties, and calling commutative "communicative"... well, these things should be corrected before publishing.

[stop08it]

it's been years since i learned this but i'm suddenly having a complete brain fart about it thanks to the stress of finals....thanks for this...

[darkskies1100]

Respond to this video... its math it cant be good

[darkskies1100]

@EliHardy65

fuck u u raised bitch 

[fangstrike1]

ughh.. school i boring... i want smosh

[unravioli]

It's sort of funny...it is the only place in the world (algebra) where two wrongs make a right (2 neg = pos)! lol

[MineIts]

@unravioli It's actually like that.

[greenranger811]

People who dislike Mr. Khan's Videos are @*&^%$ #$!&*$% (sorry for the bad language)

[MzLoren21]

thanx



[dilusasy]

thank you very much...

[bluemage100]

homework is done!

[inuyashagirlforever1]

your a saint!

[neisha23supastar]

u just gave me the anser 2 my hamwork!!!!!

[Shenzibugger]

Math made easy and fun! In the video the instructor says, "you can't divide any number by zero; that's undefined." I recall learning that a positive #/0 = + infinity and that a neg #/0 = - infinity. Am I wrong?

[3missmusicz]

Thanks So much this really refreshed my memory! i remember it by bad things that happen to bad people is good, good things that happen bad people is bad, bad things that happen to good people is bad, good things that happen to good people is good! :)

[NeverShoutMayyra]

i saw him on 20/20

[number1musiclovers]

THANK YOU ! YOUR AWESOME ;P

[mbevks]

Is like to learn WHY a negative times a negative equals a positive. I know the rule, I just don't know why.

[Mastava]

U think this guys good, listen to this: "Graduation by Kid Slim

[Mastava]

I think your a great guy ;)

[NDSLover350]

I wish I had some money so I could donate

[DjCrazyArms]

Wow, helped so much! I will pass my quiz! Thanks so much!

[isa5826]

khan academy is a big help keep it up and this guy explaination is A alright thank you very much!

[torisnorri12]

how do you write so good with that mouse..



[kshahz27]

horrible

[Poseidon3987]

@kshahz27 Um, NO, it is not horrible. This video is great, and keep your lousy comments to yourself, because 100% of this world loves this channel. You don't have the desire to learn if you think that this is horrible.

[xmenhathanh199x]

it's really helpful and plain

[JesusACruz64]

You guys are the REAL heroes!

[Jacdar3223]

This guy is the BEST!

[Hawthornenurse]

Thank you so much...I can now pass my math class because of you!

[suiteangel45]

I wonder why when you learn something in the internet,It seems easier than learning from the real!

[senju31]

thnks alot, better than all my math teachers!

[nemo2041]

i thank u a lot

[TheKirbster12]

thanks..proved a great help!!

[supercheese41]

thanks this really helped

[ion010101]

Yes but... if you're going into debt in leaps of neg 3 four times, that takes you to neg. 12. I follow that. But 3*4 and 4*3 make 12. What if you're going into debt in leaps of pos. 4, how do you do that neg 3 times? I can count four neg. threes, but how to you count neg 3 positive fours? I guess you could say, "how many times did you go into debt in multiples of 4?"

[BurmeseSamosa]

Remembering the rules is not hard but to understand what it mean or how it was derive is something you might want to explain.

[sarahshompt]

thankyou so much other times when this was explained it gave me a headache,

I'm almost a pro now :)

[vkgoku2012]

can u do proof so i dnt have to remember the rule i dnt like memorizing

[theSUICIDEoption]

thanks

[Oscy4911]

thanks

[mamaluigi21]

he made a smile =D 2:52



[hrktkt]

omg! so wish youtube was around in the 80s when i was failing algebra in h.s. and getting yelled at by the nuns! lol...really? it's that easy? i would have passed!

[jaym8]

@hrktkt The Nuns say for failing your algebra, you will burn in hell and they give you a sign and the sign is........

6 x 111, and they splash you with holy water

amen

[hrktkt]

@jaym8 i swear the reason some of them wore habits was to hide the horns!

[17nitox]

u suck

get ur shit straight

fuckin dumbass

[Astowhy]

Thank you so much Khanacadeny for this. You the ONLY one that has made this easy to understand. You know your stuff :D

[FUNNYman1808]

i can actually listin to this guy!!

[Ktayr]

I think of it like this:

If two people agree on something thats a positive thing.

We get the same answer

-1 x -1= -1

If two people disagree on something thats a negitive thing.

We get the opposite answer

-2 x 1= -2 3 x -1= -3 :)

[harrygutterballs]

@Ktayr maybe you weren't paying attention -1x-1= a positive -1x-1= doesn't equal a negative....

[propanemusic]

@Ktayr But thats not correct, -1 x -1= +1

[izzdizzz]

amazing thank you!!!((:

[amjPeace]

Sal, do you have any examples of when we apply this division by a negative number in real life please?

[MikiYoru15]

are u a teacher cuz if ur not u shuld be...

[punk3r7]

you can also do math tic tac toe. (only works for multiplying and dividing)

X|-|-

-|X|-

-|-|X

[kittyruler10]

you teach better than my teacher! im in 7th,pre algerbra, my teacher isnt good on explaining,so when i get home i come on your videos and watch what my teacher taught me,but i watch your videos, becuase you make it easier,and you are way better than explain.

Thanks

[BankaiHitsuguya]

@kittyruler10 lol me 2 but im in 7th in algebra 8th

[marcoaranas]

lol they way i imagine it zero is pretty much a black hole that absorbs anything

[tommy23r]

i love this guy... not like that, hes a great teacher! lol

[HelpWithMath1]

as usual, this video is most helpful, and well explained. thanks!

[MJGVFan]

@ khanacademy: I just got back to college again after 10 years of working full time, and I'm telling you, "You are 1,000,000 times way better than my Professor!" I wanna thank you for doing this tutorial, and how I wish my math Professor is as good as you.

[e0125194]

I just entered math 040.I havn't done this stuff in years. I go to my lecture and then come home and watch your videos!! Thank you!!

[theatremagic157]

thank you so much!!! i missed these lessons in math and my teacher wouldnt help me! neither would my friends so thank youuu!!!!!!

[kevinmarmet]

Appreciate your videos. Helps a LOT of people. I'm sure you already know that though. You dont have an annoying voice and your not boring, very good teacher. MORE VIDEOS!!!!

[ericaleverson]

So helpful!

[snozzla]

Best maths teacher ive had, great job, and thank you so much! I love his vids

[Singularitarian]

I think videos like this can have a profound impact on how education is done.

[AK47HEAVYMETAL83]

@Singularitarian so then I should just have my kids watch videos instead of sending them to school lol

[khanacademy]

@Singularitarian I think you misheard. I never use language like that in any of the videos.

[MarvelsofaLifetime]

If there are an odd quantity of negative integers then the number is negative, but if there are an even quantity of negative integers then the number becomes positive. Essentially, what will happen, is that when there are an even number of negative integers, then the negatives will always cancel each other out and become a positive.

[anneschoice]

Thankyou this really helped a lot!

[nilved33]

thank you khan :)

[wwelover999]

THX

[freefromit]

cant thank you enough, back to school at 46, forgot how that worked.

[nimlowyn]

I am ready to do some problems! Thank you!

[MrJohn0224]

thank u so much!!.u helped me with my homeork!!!!!

[MoonSpyStudios]

where are the practice ones at he talks about?

[lijro]

@MoonSpyStudios On his website

[rockerresident]

damn your so good writing through mouse

[hart1235]

Yo dawg you just lernt me with yo knowledge thanks teach. :D

[LilJmaul07]

thank you

[123aryfa]

Wow THANKS :D i finally undertstand this!

[vanquishedpowers]

Dividing & Multiplication Rule

1. Count the number of negative numbers

a) If the count is an odd number the answer will carry a negative sign

b).If the count is an even number the answer will carry a positive sign

[ApplePhenom]

Thankyou soooo much it just clicked!!!!

I did my homework without a calculator!!!

[sov19871987]

Thank you

[kchau87]

damn good tutorial

[LittleTortillaBoy100]

thanks. i got it wrong in a pre test

[Lilmissnaughtylove]

i am learnin this for my gcse at the end of year 10 and i dont get it

[monsterwasim]

this is what i am learning in my pre-algebra class.....thanks alot this is really helping me fast

[2Cool4Games]

Your math videos are awesome I am learning fast

[Al3in4today]

thanx =D i dont have a problem with it i just wanted to remember how to do it =D it's really easy ;) ty ty

[sstriker1]

thanks lots of help

[NickDirecter]

haha unlike Matteu02 i hate math! lol but i thought you vid was very good well done! 5/5

[Matteu02]

I thought I was the only one in the world who loves math

5/5

[turdcoat]

Me too

[DreamedOfHugeSpiders]

you did a great job with this but you touched on a real problem at the end. schools churn out too many kids who can solve problems without ever actually doing any real thinking. admittedly the problem is more with the student than the teacher but it's still a worry. non-thinking machines; a cog doesn't comprehend the clock!

[YourComputerTutor]

you have so many videos that if i don't understand one video i can go to another video to explain it! fantastic!

[growprovo]

Thanks!! Really, you're a great teacher...good for busy people like myself.

[SimmingLemming]

Thanks a lot - I'm stressed because we have a big test coming up.. Even tho it's not GCSE or wtevs, STILL SCARED!

[robodoggyUTube]

It reminds me of second grade when I learned that:

odd + odd = even

even + odd = odd

odd + even = odd

even + even = even

[DSMASTER911]

I HAV A TST TMROW U HLPS ME

THAK U

[kazalack]

Good thing it's a math test and not spelling.

[turdcoat]

I`m glad it`s a math test

[xxxBritishBlondiexxx]

Thanks for making it alot easier and breaking it down....:)

[kingzeus14]

This guy is awesome! I'm so gonna be top of my class now!

[tonitoni1967]

This guy is really good, He's not boring and that in itself is great!!!

[hyperobjection675]

Thank you rule!!!!!!!

[ceomeye]

thats what I talking about...breaking into nice..

[AyaDoll]

omg thanks so much!!!

P.S like ur voice very calming lol

[luigiisawsome85]

This is really great, thank you for putting this on youtube!

[kcerica]

Thanks, this really helps refresh my memory, and the statement made about multiplying what is negative # times itself x times helped make sense for why s neg and a pos would be neg but still don't understand why neg and neg would be pos.

[miaxaven]

neg and neg will be positive becuse like my math teacher said it's like saying "I am not NOT going which mean i Am going" and that is a positive statement, or something like that.

It's not really to understand just to remember, at least thats what i think.

[torerisimo]

vaya mierda se nota ke el video va de matematicas

[Cabooseee]

thank you sooooooo much!!! =]

[SoraOfTheDark]

YEAH! i can finish my homework now!

[baotruonggia]

im goana subscribe ^^

[mamaLiugi]

omg THANK YOU!! my 8th grade homework is a breeze since you taught me that :) keep it up!

[drubber1234]

Thank you! I'm preparing to take the GED and this video has helped me.

[dondisex]

Bout Time Somebody Cant teach

How to do this shit mane

[randompurple35]

why can't you be my teacher?

i could actually learn something in class!

[FreedomChicken]

This is great education and great explanation

[Zender1]

I wish I had you as my algebra teacher.

[crazymaria12]

you're very good at teaching

[Derek0783]

this was awsome. keep up the excellent lessons!

[gabier77]

can you repeat please?