Adding, Subtracting, Multiplying and Dividing Integers

Re-write the equation below to show what it would look like after applying the rule for subtracting integers (Same, Change, Change):

-10 - 5

Answer the following:

12 + (-3) =

• 15

• -15

• 9

• -9

What is the rule when adding integers? For example: 13 + (-1) =

• If the signs are the same, add and keep the sign. If the signs are different, subtract and keep the sign of the larger whole number.

• A negative times a negative equals a positive.

• Same, Change, Change

• A negative divided by a positive equals a negative.

What sign would your answer have if you multiply a negative by a negative? For example: -9(-9) =

• Positive

• Negative

What would your answer by when you multiply two numbers with different signs? For example: -5(8) =

• Positive

• Negative

True or False: The answer to the equation -10(-5) is positive.

• True

• False

Solve: -5 + (-10) =

• 5

• -15

• -5

• 15

Solve: -12/6 =

• -6

• -2

• 18

• 2

Which operations do the following rules work for:
Signs of two numbers are different, answer is negative
Signs of two numbers are the same, answer is positive

• Addition

• Subtraction

• Multiplication

• Division

The temperature was -5 degrees Fahrenheit in the morning, but by lunch time the temperature had increased 15 degrees. Which of the equations below would you use to find the temperature at lunch time?

• -5 - 15 =

• -5(15) =

• -5 + 15 =

• 15/-5 =