Sum (+) of Integers
Find the sum
(+4)+(+20)
24
3 - (-9) =
6
What are opposites?
A negative number and its positive
What is the rule for adding integers with the same sign?
a) The answer is always positive
b) Add the opposite
c) Add across and keep the sign
c
What is the addition sentence for "15 - 21"
15 + -21
-12 + 5 =
=-7
-19 - ( 15) =
-34
What is absolute value?
The number away from zero
What are the rules for subtracting integers?
a) Add the opposite then follow addition rules
b) Subtract the absolute value and keep the bigger number
c) Subtract and keep the sign
a
What is the addition sentence for "76 - 98"
76 + -98
-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) 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 addition sentence for "-94 - 357"
-94 + -357
-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
What is the addition sentence for "46 - 38"
46 + -38
-8+(-4)+12
0
-32 - (-14) =
-17
What is an additive inverse?
The same numbers that when added together equal 0 because they are opposites.
happy, right
What is the addition sentence for "-82 - -98"
-82 + 98