Sum (+) of Integers
Find the sum
(+4)+(+20)
24
3 - (-9) =
6
What are opposites?
A negative number and its positive
When would you actually subtract in an addition problem?
a) when the signs of the integers are the same
b) when the signs of the integers are different.
c) never
b
What is the absolute value of |-48|?
48
-12 + 5 =
=-7
-19 - ( 15) =
-34
What is absolute value?
The number away from zero
What are the rules for adding integers with the same sign?
a) add the absolute values and keep the sign for the total
b) subtract the absolute values and keep the sign for the difference
c) add the absolute values and take the opposite sign for the total
a
What is the absolute value of - |-92|?
- 92
-16 + (-17) =
-33
71 - (-14) =
85
When you find a sum you are ________.
When you find the difference you are _____________.
Adding
Subtracting
When adding integers with different signs you...
a) a)Subtract the absolute value and keep the sign of the smaller number
b) Subtract the absolute value and keep the sign of the bigger number
c)Subtract the absolute value then add
b
What is the absolute value of -|12|
-12
-5 + (5) - 19 =
-19
-14 - (14) =
-28
What is an Integer?
A whole number that can be negative or positive
Subtracting a negative integer is like...
a) adding a positive integer
b) adding a negative integer
c)subtracting a positive one
a
Compare |-5| ____|-10|
< less than
-8+(-4)+12
0
-32 - (-14) =
-18
What is an additive inverse?
The same numbers that when added together equal 0 because they are opposites.
When subtracting integers, which two rules should you follow?
a) subtract the absolute values and take the sign of the smaller value.
b) change the "subtraction" to "addition"
c) change the sign of the second number
b and c
Put in order from least to greatest
|-2|, 10, -4, 3
-4, |-2|, 3, 10