Adding Integers
-25 + (-15)
-40
18 - 22
-4
The temperature in Denver was -10°F on a cold December morning. After lunch the temperature had risen 20 degrees. What was the temperature after lunch?
Expression: -10 + 20
10°F
-25 + 15 - 24
-34
-43 + 18
-25
-31 - (-24)
-7
Some divers were swimming in the ocean. They were 20 feet below the surface of the water. Then they came to a coral reef that was 13 feet below the surface of the water. What was the change in their elevation?
Expression: -13 - (-20)
They increased elevation by 7 feet.
12 + (-31) - 24
-43
27 + (-55)
-28
-9 - 14
A gopher was digging 8 inches below ground. To avoid a tree root, it dug 3 inches deeper. What is the position of the gopher now relative to the surface?
Expression: -8 - 3 or -8 + (-3)
The gopher is 11 feet below the surface. -11
17 + (-24) - (-15)
8
87 + (-67)
20
-28 - 18
-46
A fish was swimming 8 feet below the surface of the water. To catch a fly it jumped 2 feet out of the water. What was the distance the fish traveled? (think change problem)
Expression: 2 - (-8)
The fish traveled 10 feet.
-15 - 8 + (-9)
-32
-30 + (-20) + 23
-27
14 - 8 - 10
-4
The afternoon temperature in Biscoff Bay was -2°F. By midnight, a warm front moved in and the temperature rose to 11°F. What was the change in temperature from afternoon to midnight?
Expression: 11 - (-2)
The temperature increased by 13°F.
-20