Sum (+) of Integers
Find the sum
(-4)+(20)
16
A football team loses 5 yards on one play and then loses 8 yards on the next play. How many yards did they lose on the two plays?
They lost 13 yards
-13
3 - (-9) =
12
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 absolute value of |-48|?
48
-12 + 5 =
=-7
You park in a garage 3 floors below ground level. Then you get in the elevator and go up 12 floors. What floor do you get off the elevator?
9th floor
-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 absolute value of -|92|?
-92
-16 + (-17) =
-33
Stephanie has $152 in the bank. she withdraws $20 then deposits $84. In an addition expression, represent this situation find the sum.
216
71 - (-14) =
85
How can you tell if an answer is going to be positive or negative?
Depending on the greater absolute value.
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 smaller number
c)Subtract the absolute value then add
b
Substitute to find the absolute value
a=-3, b= 4
|a+b|
1
-5 + (5) - 19 =
-19
You are 5 dollars in debt. You borrow 12 dollars more. But then pay back $3. What is the total amount of your debt?
You owe 14 dollars
(-14)
-14 - (-14) =
0
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
-5 ____-10
> Greater than
-8+(-4)+12
0
An airplane takes off and then climbs 500 feet. After 20 minutes, the airplane descends 150 feet. It sees another plane and rises 200 feet. What is the airplane's current height?
550 ft.
-32 - (-14) =
-17
What is a zero pair?
The same numbers that when added together equal 0 because they are opposites.
When adding multiple integers, what is a smart way to solve...
a) find additive inverses
b) add similar signs first
c)look at the signs
ALL OF THE ABOVE
Put in order from least to greatest
|-2|, 10, -4, 3, |2.5|, |-0.8|
-4, |-0.8|, |-2|,|2.5|, 3, 10