Word Problems
Jason dives 10 feet under water and swims back up 3 feet. Where is his current location in the water?
-10 + 3= -7
What is the rule for adding two integers with the same sign?
You add the numbers and keep the same sign.
Chris gets paid $100, and then must pay his cable bill which is $245. How much money does he have?
100 - 245 = $-145
What is the rule for adding integers with different signs?
You subtract the numbers and keep the sign of the number with the greater absolute value.
The temperature is now 76 degrees, it rose 12 degrees overnight. What temperature was it last night?
76-12 = 64 degrees
What is the rule for subtracting integers?
You keep the first number, change the subtraction sign to addition, and change the sign of the second number.
The temperature at sunrise was –6°F. By the afternoon, the temperature rose 9 degrees, but then dropped 5 degrees in the evening.
-6 + 9 + (-5) = -2
-10 + 30
20
In a game, Jareek earned 15 points in the first round, in the 2nd round he lost 20 points for not showing sportmanship. In the final round he scored double what he did in the first round. What is his final score?
15 + (-20) + 30 = 25 points
What do you do if you see a subtraction problem with integers?
Rewrite the problem as addition and then follow the rules for adding integers.