Important Concepts
Adding Integers
Subtracting Integers
Word Problems
100

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

Subtract and take the sign of the larger #

100
-5 + 9
4
100
-4 - 6
-4 + (-6) = -10
100
Jason dives 10 feet under water and swims back up 3 feet. Where is his current location in the water?
-10 + 3= -7
200

How do you subtract integers?

Keep the 1st # the same

Change subtraction to addition

Change the sign of the 2d #

200
-12 + 5
-7
200
4 - 11
4 + (-11) = -7
200
Chris gets paid $100, and then must pay his cable bill which is $245. How much money does he have?
100 - 245 = $-145
300

Is 0 positive or negative?

Zero is not + or - 

It's just zero!

300
-16 + (-17)
-33
300
15 - (-7)
15 + 7 = 22
300

The temperature is now 76 degrees, it rose 12 degrees overnight. What temperature was it last night?

76-12 = 64 degrees

400

What is an integer?

Integers can be + or - but they must be a whole # (no decimals or fractions)

400

23 + -6

17

400
-27 - (-3)
-27 + 3 = -24
400

In a game, Jareek earned 15 points in the first round, in the 2nd round he lost 20 points for not showing sportmanship. In the final round he scored double what he did in the first round. What is his final score?

15 + (-20) + 30 = 25 points

500

What is this called? |-6| = 6

Absolute Value

Absolute value turns any # + and tells us how many spaces away the # is from 0

500
-16+18+-17
-15
500
-10 - 11 - (-3)
-10 + (-11) + (3)= -18
500

Nikka starts with $1000 in her bank account, she withdraws $750 to pay her rent. She lets a friend borrow $70, buys new clothes for $120. She finds $100 cash on the street. How much money is in her bank account?

$160

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