Cornell Notes in Math – IN pg 31
Class Notes
Name:
If there was no class lecture
this week, write a paragraph
Class: Pre- algebra
about what you learned and/or
questions about what you didn’t
Period: 2/5
understand
Reference: Pg 23-28
Date:
9/27/10
Questions/Main Ideas:
Notes: Adding Integers
Rules for adding integers
Same sign add the numbers and use the sign
ex. -3+(-5)=-8
3+5=8
(- - - )
(+ + + )
+ (-----)
+ (+ + + + +)
Different signs1. subtract the two numbers
2. use the sign of the one with the greatest
absolute value.
ex. -3 + 5 = 2
3 + (-5) = -2
- - + + +
+ + +++
- - - - Additive inverse – to add opposites together to
create a sum of zero
|
|
|
|
|
|
|
-3
-2
-1
0
1
2
3
-3 + 3 = 0 - - + + +
a neutral field –value =0
Summary:
When adding integers, if the signs are the same, the sign of the _______ will be
the same. If the signs are different, the sign of the sum will be the same as the
sign of the integer with the greatest _________________ _______. When you
add opposites, it is called the ____________ ___________. The sum will always
equal ______.