Chapter 2 Vocabulary

Absolute Value: The absolute value is how far a number is from zero.



Additive inverses or opposites: Additive identity states that the sum of the number and zero yields the same number.





Irrational Numbers: Any real number that can not be expressed as a fraction.








Measure of Central Tendency: The three most common measures of central tendency are the mean, the median a
and the mode.













Odds: The ratio of a pair of integers.






 


Perfect Square: A integer that is a square of an integer. For example 9 is a perfect square because 3 x 3 is 9. 









Probability: The chance of something happening.














Rational Number: Fractions, and decimals that repeat or terminate.

Adding and Subtracting Integers

  

 a) 5 + -8 = -3 

The first step is to subtract, 8-5 which is 3. 

Then you take the sign of the number with the greater absolute value.

b) -4 + 10 = 6 

The first step is to subtract 10-4 which is 6.

Then you take the sign of the number with the greatest absolute value.

c) 4 - 9 = -5

You keep, change, flip. That means, keep the first number the same. Change the sign to addition. Flip the sign of the second number. That means the equation has turned into 4+-9 so you subtract 9-4 which is 5 and you take the sign of the number with the greatest absolute value. Thats why its -5.

d) -8 - (-9) = 1

You do the same thing as we did in c. Keep, change, flip. Therefore the equation is -8 + 9, so you do 9 - 8 which is 1 and you take the sign from the number with the greater absolute value. Thats why its +9. 

      

Spreadsheet!

https://docs.google.com/spreadsheet/ccc?key=0Apj-dQHWsOTXdEkzMU5IQTRRR3BVcmFYM185eXZvT3c&hl=en_US#gid=0

Spreadsheets can be used in math for organizing data. It can also be used for showing your data in an easier way to see.