dividing integers
DESCRIPTION
DIVIDING INTEGERS. IN ALGEBRA COUNTY. 5 DIVIDED BY 6. CAN BE WRITTEN:. 5 DIVIDED BY 6. That’s the best way. What does division mean?. could mean 12 m&m’s divided among six people. Each person has a dixie cup. could mean 6 m&m’s divided among four people. Each person has a dixie cup. - PowerPoint PPT PresentationTRANSCRIPT
INALGEBRA COUNTY
DIVIDING INTEGERS
5 DIVIDED BY 6
CAN BE WRITTEN:
5 6 56
6 5
5 DIVIDED BY 6
56That’s the
best way.
could mean 12 m&m’s divided among six people. Each person has a dixie cup.
126
What does division mean?
126
126
126
126
126
2 each
64
could mean 6 m&m’s divided among four people. Each person has a dixie cup.
64
64
64
11 each
2
DIVISION RULES FOR NEGATIVE
NUMBERSARE THE SAME
AS FOR MULTIPLICATION
Therefore:
Positive positive =Positive negative =
Negative positive =Negative negative =
+-
-+
The number 1 is very important in Algebra County:
55
44
-11
Write these in your notes:
14
1.2
7
25
2.5
5
73.
7 1
“Subtracting” Integers
InAlgebra County
In Algebra County, we don’t actually subtract. We think of the minus sign as a negative.
3 - 5We can circle the number
with its sign.
We have 3 and negative 5
-4 - 5 Negative 4 and negative 5
-1 + 3 Negative 1 and 3
7 - 2 7 and negative 2
-9
2
5
Remember how we put a “1” in places
where it is understood to be? 3 - (- 5)3 and negative 1 times negative 5
1
-4 - (- 5)Neg 4 and neg 1 times neg 5
-1 - (- 3)Neg 1 and neg 1 times neg 3
7 - (- 2) 7 and neg 1 times neg 2
1
1
1
-4 - (- 5)1
-4 + 5
Negative times
negative is positive.
1The
answeris:
Wemultiplybeforeadding
Write these in your notes:
-1 + 3
Negative times
negative is positive.
2The
answeris:
-1 - (- 3)1Wemultiplybeforeadding
7 + 2
Negative times
negative is positive.
9The
answeris:
7 - (- 2)1Wemultiplybeforeadding
-3 + 1
Negative times
negative is positive.
-2The
answeris:
-3 - (- 1)1Wemultiplybeforeadding
Now you have learned how to
“subtract”Without subtracting
This is a symbol used in math. It shows that a
number is definitely positive and is called the absolute
value symbol.
We put numbers or variables inside the lines.
3 = 3The answer is 3 because the absolute value of anything is
positive.
3 = 3The answer is 3 because the absolute value of anything is
positive.
Even if we have a negative inside the absolute value
sign:
Here’s an
example:
5 7 =
2 2We add the
numbers inside first.
=
The End