Adding Integers
-35 + -80 =
-115
15 - 20 =
-5
What is the rule for adding two integers with the same sign?
Add them and keep the sign the same
-0.5 - 3
-3.5
A tennis ball is thrown into the ground and it bounces up 10ft into the air. Then it lands on the ground and bounces 5 feet into the air. Then it lands on the ground and rolls away. Write an equation to show the elevation of the tennis ball
0 + 10 - 10 + 5 - 5
-80 + 90
10
90 - (-10)
100
What is the rule for adding integers with different signs?
Subtract and take the sign of the number with the greater absolute value
-10/(1/4) + (-5/(3/4))
-16
A phone battery has 100% charge. Then someone uses it to watch youtube for an hour. The battery decreases to 82%. What was the change in battery life over one hour?
-18%
-7 + 80 + (-15) =
58
80 - 70 - 30 =
-20
What is it called when two opposite numbers have a sum of 0?
Zero Pair
-8.3 - (-5.4) + 2.9
0
The top of a anthill is 4cm above the ground. The bottom of the anthill is -9cm below the ground. What is the distance between the top and bottom of the anthill?
13cm
-90 + (-10) + 100
Zero
100 - 5 - (-13) - (-6)
76
What is the rule for subtracting integers?
Subtracting integers is the same as adding the opposite number
-15/(2/8) + 5/(1/4)
-10
A bird lands on a roof. Then it flies 7m relative to the roof. Then it goes -20m relative to the roof to eat a worm. What is the total distance the bird flew?
27m
80 + (-10) + 15 + (-100) =
-15
-20
When a questions asks you to compare the values, what operation should you use?
Subtraction, to find the difference.
-20/(3/8) + (-3/(2/4)
-23/(7/8)
Ruth is playing a game. First she loses 4.8 points. Then he gains 2.5 points. Then she loses another 7.8 points. Write an addition expression.
-4.8 + 2.5 + (-7.8) =