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Positive and Negative Numbers


We begin with a set of videos where models are used to understand and explain how to add, subtract, multiply and divide with integers. In these videos, there are no fractions or decimals involved--only positive and negative whole numbers such as -3, -2, -1, 0, 1, 2, 3, etc.  Below these three basic videos with integers are videos containing negative numbers that may be fractions or decimals. These are for students who already learned how to compute with fractions and decimals.  


ADDING, SUBTRACTING, MULTIPLYING AND DIVIDING INTEGERS


Adding Integers

Shows how to add postive and negative numbers; uses counters.

http://www.youtube.com/watch?v=AIWPLvTNhXs


Subtracting Integers

Shows how to subtract with positive and negative numbers; uses counters. Explains adding the opposite and the two stroke method.

http://www.youtube.com/watch?v=0sMIJkFV1uw


Multiplying & Dividing Positive & Negative Numbers

Shows the rules for multiplying and dividing with negative and positive numbers. Shows why negative times negative produces a negative number using counters.

http://www.youtube.com/watch?v=489iteE0EB4


See Exponents Basics, Exponents 1, and Exponents 3 for videos where the exponents are positive, but where the base might be negative, or negative signs may be in front of the base.


Below are  videos show you how to add, subtract, multiply and divide when working with positive and negative numbers that might be fractions or decimals.  


Videos with both Fractions that may also be Negative 
(These videos are for students who have already learned about fractions.)

Videos with both Decimals that may also be Negative 
(These videos are for students who have already learned about decimals.)

Decimals 7 (Add/Subtract positive and negative decimals Part 1): http://youtu.be/7QEmT3iJBtU

Decimals 8 (Add/Subtract positive and negative decimals Part 2): http://youtu.be/qJzYcLE7_Mg

Decimals 10 (Multiply Positive and Negative Decimals): http://youtu.be/oUzgwvBRSDE


To understand negative exponents, see Exponents 6, 7 & 8.

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