Addition with regrouping | Addition and subtraction within 100 | Early Math | Khan Academy

Learn to add 35 + 27 thinking about place value. This example requires regrouping.

Missed the previous lesson?

Early Math on Khan Academy: Math begins with counting. It's the most important skill we learn in our early years and becomes the foundation for all other math concepts. Once we can count, we can add, subtract, and measure the world around us. Shortly thereafter, we can learn about place values, plots, graphs, time, money, and shapes. These early math skills are presented in this subject's tutorials in a straightforward, understandable, and (dare we say it) fun way!

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

For free. For everyone. Forever. #YouCanLearnAnything

Subscribe to KhanAcademy’s Early Math channel:

[Radtrad]

Khan. I used you for organic chem, back in my college days. Years later and I've come back to get help for my son! You are such a wonderful teacher! Thank you!

Wow..geeze I'm getting old..lol

[Mswordx]

Wow is this Sal? He sounds really different...

[welovemads]

Why do I find his voice very soothing!? xD

[marcduperron]

I have learned how to multiply when I have written an assembler program to multiply.
If you want to multiply two numbers that can have up to 256 digits each, how would you do that? for example X = ?
I wrote an assembler program to do that, on a 6502 microprocessor. My program was very fast. The result could be a number with 512 decimals at most. I have used a multiplication table to do the multiplication of two numbers. Instead of adding numbers, I would just use a table, like 8 X 8 = 64. No need to compute it. I had a table whit two indexes that would tell me that 8 X 8 is 64. No need to add 8 times 8. My program was the fastest algorithm to multiply these numbers.
I have got an A grade!

[you_.-dnt_.-._know-._me]

It so freakin EASY I could do this in a second

[srinivasanthirunavukkarasu]

Addition of tens place wasnt madr clear as that of units place