Multiplying and Dividing Integers

YouTube Playlist on Real Number Operations

Multiplying a negative number by a positive number will result in a negative number. And when multiplying two negative numbers the result will be positive. Be careful when simplifying 5(−6), the operation here is multiplication NOT subtraction so 5(−6) = −30. The rules for division are the same.

(Negative) x (Positive) = (Negative) 

Example: (−7)(+4) = −28

(Negative) x (Negative) = (Positive) 

Example: (−7)(−4) = +28

Also, zero times anything is zero.

Multiply or Divide.

Dividing by zero is undefined. What happens when you try to divide by zero on a calculator?

Zero and Division

Divide.

Video Examples on YouTube:

Elementary Algebra Exam #4

Click on the 10 question exam covering topics in chapter 7 (Rational Expressions and Equations). Give yourself one hour to try all of the problems and then come back and check your answers.

[ PDF -> Elementary Algebra Sample Exam #4 ]

Simplify (Assume all denominators are nonzero.)

Perform the operations and state the restrictions.

  

Solve.

 

  

10. The sum of the reciprocals of two consecutive odd integers is 4/3.  Set up an algebraic equation and use it to find the two integers.

---

J. Redden on Google+

Elementary Algebra Exam #4 by John Redden is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.

Elementary Algebra Exam #3

Click on the 10 question exam covering topics in chapters 5 and 6. Give yourself one hour to try all of the problems and then come back and check your answers.

[ PDF -> Elementary Algebra Sample Exam #3 ]

10. The length of a rectangle is 4 centimeters less than twice its width. The area is 96 square centimeters. Find the length and width. (Set up an algebraic equation then solve it)

 
---

J. Redden on Google+

Elementary Algebra Exam #3 by John Redden is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.