Adding and Subtracting Integers

Vocab

100

Absolute Value

The distance of a number from zero

200

Integer

The set of whole numbers and their opposites.  They can be positive or negative.

300

Opposite

The opposite of a number is the same distance from zero as the original number just on the other side of zero.

400

|-6|

Absolute value of -6 = 6

500

6 and -6

Opposites

Adding Integers

100

-5 + 9

4

200

-12 + 5

-7

300

-16 + (-17)

-33

400

How do you find the sum of numbers with different signs

Subtract and take the sign of the number with the greater absolute value

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

adding its opposite

500

-10 + (-2) - 5

-17

Application

100

The temperature at 1:00 pm is 5 degrees below zero.  Between 2:00 pm and 5:00 pm, the temperature drops another 7 degrees.  Write an expression that describes the situation.

-5-7

200

What expressions is equal to 5 + (-2)? 

5 - 2

300

-30 and 70 have a difference of?

100

400

Solve:

2 1/4 - 5 3/4 = 

-4 2/4 or -4 1/2

500

Solve: -4.1 + 2.8 =

-1.3