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Friday, December 14, 2012

Bianca's Integer Post

Dividing integers

Today in class we learned about dividing integers.

First of all it follows the sign rules too.
  • If you have the same sign the answer is a positive integer.
  • If you have different signs the answer is a negative integer.
There are two ways to write a division statement and their questions in words.
eg.

1.)
12 ÷ 3 = 4

12
 3 = 4
 
  • How many groups of 3 are in 12?                   












  •   Share 12 equally with 3 groups     
                         

2.)

-12 ÷ -3 = 4

-12
 -3  = 4

The "share" sentence doesn't work with this question because it won't make sense.
  • How many groups of -3 are in -12?








3.)
 -12 ÷ 3 = -4

-12
  3   = -4

  • Share -12 equally with 3 groups







4.)
12 ÷ -3 = -4


 12
 -3  = -4
NOT:
- How many groups of...
- Share 12 with -3 groups
  • because the statements would not make sense.
Instead you use the "Multiplicative Inverse"
-a multiplication question that asks the same question as the division

Division: 12 ÷ -3 = -4
Multiplication: ? x -3 =12      ? = -4

There is no picture for this one.

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