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

I explain three different models you can use to show why subtraction of integers works: 1) number line jumps; 2) concept of difference; 3) positive/negative counters. The bottom line is that students need to learn the shortcuts and rules, but these models can help justify the rules.

Category:

Education

Tags:

• subtraction
• integers
• negative numbers
• number line
• mathmammoth

[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!

[Zachx122]

2:36 what does she say? 

[MathMammoth]

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

[Ktayr]

Where are you from?

Your accent is very neat.

[MathMammoth]

@Ktayr I'm originally from Finland.

[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?

[chrissline77]

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

[Miner5460]

Thank you. :]

[Annessa500]

 THANK YOU

[saccharineDEATH]

thank you for posting!

[citrusatl]

Great job! Thank you!!!