Arithmetic of Integers
Arithmetic of Integers
Video
This video from Khan Academy discusses the various cases of adding and subtracting when dealing with negative integers, using a number line to justify the results.
Note: All Khan Academy content is available for free at www.khanacademy.org.
Multiplication of Positive and Negative Integers
Video
This video from Khan Academy gives the rules for multiplying positive and negative integers, along with various examples.
Note: All Khan Academy content is available for free at www.khanacademy.org.
If you’re curious about why a negative number multiplied by another negative number gives a positive result, see this video by Khan Academy which explains why this is the case due to the distributive law of multiplication.
Note: All Khan Academy content is available for free at www.khanacademy.org.
Notes
Pages 6-8 of these notes from MathCentre discuss the rules of multiplying positive and negative integers, along with example. There are exercises on page 9 with the answers given, so you can check your work.
A pdf of this document can be downloaded here.
Interactive Exercises
This NUMBAS exercise lets you test what you’ve learned about multiplication and division of integers. There is also a small section at the end which tests your knowledge of the order of operations.
Please click here to view this NUMBAS question in another window.
Division of Integers
Videos
This video from Khan Academy discusses the various scenarios that can occur when dividing positive and negative integers.
Note: All Khan Academy content is available for free at www.khanacademy.org.
