Adding and Subtracting Integers

A submarine at -32 feet dives down 18 feet. After the dive, what will be the submarines elevation?

• 14

• -14

• -50

• 50

-5 - (-17) ... Which addition sentence represents the same problem?

• -5 + 17

• -5 + (-17)

• 5 + (-17)

• 5 + 17

8 - 14 ... Which addition sentence represents the same problem?

• 8 + (-14)

• 8 + 14

• -8 + 14

• -8 + (-14)

8 - 10

• -2

• 2

• 18

• -18

-35 - (-10)

• -25

• 25

• 45

• -45

15 - (-15)

Rules for Adding Integers

• Add the Numbers

• Different Signs

  (What to do...)

• Subtract the Numbers

• Same Signs

  (What to do...)

• Keep Sign of "Larger"

• Different Signs

  (Final Result)

• Keep Sign of Both Numbers

• Same Signs

  (Final Result)

Q1. What is the result of 5 - 12?

• A) 7

• B) 5

• C) -7

• D) -5

Q1. What is the result of 9 - 10?

• A) 9

• B) 10

• C) -9

• D) -10

Bob lost 5 points on page one of his math test and he lost 9 points on page two of his math test.  Which equation best describes Bob progress on his math test?

• 5 + 9 = 14

• -5 + -9 = -4

• -5 + -9 = -14

• 5 + -9 = -4