Adding and Subtracting Integers

Vocab

100

Integer

The set of whole numbers and their opposites.

200

What is the opposite of a negative integer?

A positive integer

300

What is the opposite of a positive integer?

Negative integer

400

What is the opposite of (+ 9)?

- 9

500

What is the opposite of (- 10)?

+ 10

Adding Integers

100

-5 + 9

4

200

-12 + 5

-7

300

-16 + (-17)

-33

400

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500

-16+18+-17

-15

Subtracting Integers

100

-4 - 6

-10

200

4 - 11

-7

300

15 - (-7)

22

400

-27 - (-3)

-24

500

-10 - 11 - (-3)

-18

Mix

100

-2 - 3

-5

200

-10 + 30

20

300

21 - (+5)

16

400

Subtracting a negative is the same thing as...

Adding a positive

500

-10 + (-2) - 5

-17

Rules

100

What is the rule for adding integers with the same sign?

If same sign, add the integers, and keep the sign.

200

What is the rule for adding integers with different signs?

If different signs, subtract the integers, keep the larger sign (absolute value).

300

What is the rule for subtracting integers?

KEEP the 1st number the same

CHANGE the subtraction sign to addition

CHANGE the 2nd number to its opposite

400

How do you find the sum of numbers with different signs?

Subtract and take the sign of the bigger number

500

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