Subtracting integers video - three models to explain how subtraction of negative numbers works

[crunkerdrunk]

Thank you so much for contributing to free knowledge! You're a star!

[maitha100]

@skitt1z1 if you have 2-(-2) that means you have two minus's beside each other which automatically turns into addition so basically it'll be 2 + 2 which equal 4

[skitt1z1]

I dont understand how 2 - (-2) can be 4. How can takeing property away from the initial 2 make it become a larger number? it does not make any logical sence to me :S any help?

[Miner5460]

Thank you. :]

[Annessa500]

THANK YOU 

[saccharineDEATH]

thank you for posting!

[minajbieberspence]

GREAT JOB!

Youuu helped me understannd much better ! (:

MY STUPID teacher couldn't explain better thaan youu, !

Are youu a teacher, fuuur realll?

Or just kind of a ...

Youtubee teachheR? :D

[MathMammoth]

@minajbieberspence Yes, I'm a real math teacher. I went to a university, studied, and got my degree. I'm glad you understand it better now!

[citrusatl]

Great job! Thank you!!!

[Zachx122]

2:36 what does she say? 

[MathMammoth]

@Zachx122 I say, "Remember to put a negative here..."

[TheArceus12345]

OMG thanks!! I finally learned how to do it! Now i can do every single subtraction question!!!!

[ZeroSumRuler]

I learned an awesome model today at an interview, of all places. The "as compared to" model for subtraction. Take "7 - 2". This can be read as "7 as compared to 2", which leads to an answer of "they are comparably 5 apart".

It also works for subtracting negatives! "7 - -2" can be read as "7 as compared to -2", which leads to an answer of 9 since 7 and -2 are comparably 9 spaces apart!

So awesome!

[psptechnologypsp]

Very Very helpful, better than the "yourteachermathhelp" videos.

Nice that you are doing this just to help us.

[ninjakirby12]

Thanks a lot, I've finally got it.

[xxxNaughtySmurfxxx]

Thanks a lot for you're time.

really helped me since i'm having a test about this Tomorrow .

[Hartleyrose]

Thank you SO much, so helpful for my student.

[megamayo21]

:D Thanks so much... I was doin my homework and i dn't get it and i was mad then my mom showed me this and i watched it like 4 times! :D i kinda understand it! And u sound like u our from sweden or finland i can talk some of it! :D Mitah Kuuluu! or something like that my OLD friends mom is from there and they taught me lots! U sound alot like her mom with accent!

[brittleCFbullet87]

@_@ These integers are driving me crazy.

[Ktayr]

Where are you from?

Your accent is very neat.

[MathMammoth]

@Ktayr I'm originally from Finland.

[chrissline77]

I do not understand this. And I can't move on to Algebra until I do.

[tutoringecon]

Did you get that board from costco? I have the same one...awesome!

[MathMammoth]

@tutoringecon No, it was some other store. But chances are the boards could have both been made in China... can't check mine now, it's screwed to the wall.

[roudy1689]

you fixed in 7 minutes what it took years for me to never get

[TheMathRider]

Nice job, and great that you show various ways of thinking about the same operation.

[ZeroSumRuler]

I made a colorful animation-style video on how to add and subtract positive and negative numbers. I hope you give it a whirlio! (It's on my page)

[MegaJoaquin11]

thanks

[shanadono]

I created a tool to help kids with this very concept. It's a hard one, even for top achievers. My professors tell me that calculus students get caught up in the algebra, and I think the same is true for algebra students and arithmetic (negatives!)

[JudyGlam]

wow first i thought this would be like for little kids, but i clearly understood this and it so helped me with my test yesterday :)

[wolverine338]

very helpfull vid thx fur trying (y) = msn = thumbs up

[nancysue4u]

thanks this was very helpful

[MathMammoth]

katherinepapp,

it is Finnish.

[katherinepapp]

Great job! Thanks! What is your native language?

[cookiemonster4616]

Thank you So Much

[kurozaki45]

thank you

[justmelez]

thank u very much u are the best

[justmelez]

you are a excellent teacher THANK YOU i am old and have to take a test for college

[XdigopeX]

Thank very much!!!!!!!!!!!!!!!!!!!!!!!

[THEMRMARUCHAN]

Thanks youre the Best

[Angel14Dark]

your the best teacher ever i see!!!! thank you so much!

[mytbp26]

good help

[1523119]

You are wonderful! Thank you. :D

[dogdoog989]

Cool