Addition
4 + (-13) =
-11
19 - 13
6
-4 * (-4)
16
30 / (-3)
-10
When Steve woke up. His temperature was 102º F. Two hours later it was 3º lower. What was his temperature then?
Subtraction
102 - 3 = 99
15 + (-10) =
5
9 - (-5)
14
5 * 5
25
-18 / (-3)
6
It will be – 12º tonight. The weatherman predicts it will be 25º warmer by noon tomorrow. What will the temperature be by noon tomorrow?
Addition
-12 + 25 = 13
-2 + 12 =
10
-7 - 4
-11
15 * (-2)
-30
25 / 5
5
Felix reported that the coldest day on record for his town was five times colder than yesterday’s temperature, –4º C. What was the temperature of the coldest day on record in Felix’s town?
Multiplication
5 * (-4) = -20
positive + positive = ___
addition (always positive)
negative - negative =
addition (not always negative)
negative * negative =
positive
negative / negative
positive
If the temperature decreased by 12º C over 6 hours, what was the average temperature decrease per hour?
Division
-12 / 6 = -2
How do you add integers with DIFFERENT signs?
Subtract and keep the sign of the larger absolute value
How do you subtract integers?
Add the opposite sign
positive * negative =
negative
negative / positive
negative
The elevation of Mt. Everest is 29,028 feet. The elevation of the Dead Sea is –485 feet. What is the difference in the elevation between Mt. Everest and the Dead Sea?
Subtraction
29028 - (-485) = 29513