Integer Subtraction

What is the rules for subtracting integers?

• Change to multiplication and use the opposite of the second number.
• Change to addition and use the opposite of the second number.
• Find the opposite of both numbers and then add. 
• Subtract like normal and keep the larger sign. 

How would -9 -(-5) look like as an addition problem?

• -9 + (-5)
• 9 + 5
• -9 + 5
• 9 + (-5)

What would 12 - 20 look like as a addition problem?

• 12 + (-20)
• -12 + (-20)
• 12 + 20
• -12 + 20

5 - 2

• 7
• 3
• -3
• -7

-3 - 2

• -1
• -5
• 1
• 6

-7 - 2

• -9
• 9
• 5
• -5

19 - (-19)

• 0
• 36
• 26
• 38

-7 - (-7)

• 14
• 0
• -14
• 1

The temperature on a cold winter day starts out at 10 degrees, but it drops rapidly 24 degrees due to a strong cold front moving in.  What is the current temperature?

• 14
• 34
• -14
• -34

I had $-25 in my account.  I deposited $70 into my account.  How much money do I have now?

• $105
• $-45
• $45
• -$105