Adding, Subtracting, Multiplying and Dividing Integers

What is the rule when subtracting integers?

For example: 13 - (-12) =

• Keep the signs and add

• Same, Change, Change

• A positive times a negative is a negative

• Same, Same, Change

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

Solve: 10 - (-18) =

• 8

• 28

• -8

• -28

What are the rules when multiplying or dividing integers?

• Same, Change, Change

• When adding or dividing two integers, if the signs are the same, the answer is negative, but if the signs are different, the sign is positive.

• When adding or dividing two integers, if the signs are the same, the answer is positive, but if the signs are different, the sign is negative.

• Same, Same, Change

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

• True

• False