Adding and Subtracting Integers

A submarine was 1800 ft below sea level. It dove another 1500 feet deeper. Which integer represents its location? 

• -300

• -1300

• -3300

• 300

Express an integer: a withdrawal of $100

• 100

• -100

Express an integer: a plane descended 3000 ft

• 3000

• 300

• -300

• -3000

• -7 + 4 = -3
• 7 + (-4) = 3
• 7 - 4 = 11
• 7 + (-4) = -11

• -3 +7 = 10
• 7 + (-3) = 4
• 7 + (-10) = -3
• 10 + (-3) = 7

The temperature at the beginning of the day was 6 degrees F. The temperature dropped 9 degrees F by the end of the day. What was the temperature at the end of the day?

• 3

• -3

• 15

• -15

A car backs up 23 feet, followed by 9 more feet. The car's position can be represented by the expression  -23 + (-9). What is the sum?

• -32

• 32

• 14

• -14

-15 + -8 =

• 23

• -23

• 7

• -7

13 + -21 =

• 34

• -34

• 8

• -8

Joy earned 13 points in her first round and -21 points in her second turn. What was her score after 2 turns?

• 34

• 8

• -34

• -8