Math Help: Adding and subtracting with negative numbers

This ten-minute video from Khan Academy uses the number line to help you visualise adding and subtracting negative numbers. It's a long video, but it's worth watching the whole thing.

 

If you remember lyrics easily, the song in this video can help you remember how to add and subtract integers.

 

This short video explains why subtracting a negative is the same thing as adding a positive.