Add and Subtract Negatives

Find the solution:

-50 + 30

Which pattern applies to this problem:

• Same sign: ADD and KEEP

• Different sign: SUBTRACT, KEEP the SIGN of the one with MORE

• This problem is impossible

How do we subtract negative integers?

• Add the Additive Inverse

• Keep Change Change

• We cannot subtract negatives from negatives.

• If we subtract negatives we get more positives.

Choose the integer operation problem(s) that this number line represents.

• -9 + (-7) = -2

• -9 + 2 = -7

• -9 + 7 = -2

• -9 - (-7) = -2

• None of these

3 - (-3) =

• 6

• -6

• 0

• -4

-3 + (-2)

• -5

• 5

• 1

• -1

-18 + 12

• -6

• 6

• 20

• -30

10 - 18

• 28

• 8

• 12

• -8

8 - 12- (-6) =

• 2

• -2

• 18

• -18

The water level is Mr. Jacob's pond was -4 feet. After a drought, the water level dropped by 13 feet. What is the water level after the drought?

• -17 ft

• 17 ft

• 9 ft

• -9 ft