Subtraction 3: Introduction to Borrowing or Regrouping

[143OMGJESS]

cool

[143OMGJESS]

THESE ARE REALLY HELPFUL I LIKE THESE VID

[silentpride23]

im 17 and i still dont know how to borrow until now

[Neoshon421]

yay math!!!!!!!!!!!!!!!!!!!!!

[harrypotterlover465]

how did you learn this genius?

[madlollpop]

@harrypotterlover465

he has a websit it is khanacademy . org

[blake4tkd]

this Is great

[PurdyBear1]

Its interesting to see different ways of doing things. When I was a kid donkeys years ago we put the 1 on the bottom rows. LOL! We also put the subtraction sign on the other side. Maybe the difference between UK teaching and US LOL! It all works out the same.

[Snapwave]

I am a language teacher who never did well in math, thanks partly to being a lazy student back then, and largely to teachers simply expecting me to KNOW math, a problem which compounded itself every year.

I don't know how to explain how excited I am to finally understand subtraction without just seeming sad.Thanks for the help.

[MrPWNSTER]

lol i love how long the video is and how much he cover its really great

[dgammar]

im taking calculus and i forgot how to do borrowing so i have to watch this

[sandyxclaus]

thanks 4 helping me! i get it more!

[wiseguybg]

When I was at school, I was thought a cleaner notation where (also useful in Subtracting decimals, etc.) you put dots on top of digits that you borrow from. This way you know that the digit on the right has taken a 10 and also that the digit with dot on top has 1 less. Following the example above (953-754), 9 and 5 will get a dot as follows:

..

953

754

-----

199

[sephyiroth]

This is better than College Classes if you ask me..I need some retouching on math again and this guy's work is better than College classes that don't care about you and just want your money.

[Cyrian1]

hey im home schooled

[HelpWithMath1]

This should be compulsory viewing in all schools. In fact, I wonder if we'll soon end up with half the world going to homeschooling, given all these videos...

[dvdknight1]

Thank you for your videos, I've watched several vids about your story as well. Thank you!

[brigadierBlackhawk]

dude if i could id kiss ur ass this is so bloody simple i feel like a retard not knowing

[vickiormindyb]

I have problems with addition and subtraction constantly, b/c the left temporal part of my brain was struck on impact by a car going 50 mph when it hit me. My head hit the driver's side window w/ full force.

My doctor was surprised I can subtract 2 and 3-number problems: like 32 - 17 or 247 - 168. I couldn't before w/out getting a headache peculiar to the injury.

I'm only able to do the Math problems b/c of these videos.

[mickeymouselover1998]

Ur pretty good explaning!=)

[Danny77uk]

I was never taught to do it this way at school. We had to go into negative numbers!

Thanks so much!

[bjserrato]

It's the little slips you leave in, and the casual top-of-your-head feel that makes your videos so compelling. Only rarely do I believe you possibly chose the numbers before beginning the video. Keep it that way.

(see 9:25 for an example)

[SHYx999]

@bjserrato hah . that slip that happens to Sal at 9:21 on , is what my dyslexic brain keeps replaying for the past 20+ years when trying to borrow =( . hopefully by the end of this vid it'll be smooth sailing .

[gruelin1]

Wonderful! Sal makes the teaching of even very elementary subjects compelling!

[TheBatchGuy]

I love watching these videos... Super teaching!