Adding and Subtracting Integers

Vocabulary

100

What is the definition of an integer

Positive and Negative whole numbers and the number zero.

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 definition of absolute value?

a number's distance from zero

500

What is the opposite of (- 10)?

+ 10

Adding Integers

100

-5 + 9

4

200

-12 + 5

-7

300

-16 + (-17)

-33

400

-25 + -60 + (-30)

-115

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 + (-16) + 8

-29

400

19 + (-6) - 10 

3

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

-10 + 20 = 

Would the answer be positive or negative? Why?

Positive because the larger number is positive

500

-50 + 20 =

Would your answer be positive or negative? Why?

It would be negative because the larger number is negative.