Adding and subtracting negative numbers - a visual approach
Channel: Chris Heddles
Date: 2016-05-16

Learn how to add and subtract negative numbers to totals above and below zero using a number line. Rather than just memorised rules, this video will help you understand why those rules work.

Here is the video referred to at 0:07
https://www.youtube.com/watch?v=IEL3PictvZ8

Click here to download the Free, open-source software (FOSS) that you see used in this video:
https://sites.google.com/site/beginnerprogrammingatasms/sample-programs/addingsubtracting