Adding and Subtracting Integers Review

Important Concepts

100

Absolute Value

The distance of a number from zero

200

Integer

Positive and negative whole numbers and 0

300

What are additive inverses

Numbers that are opposite and have a sum of zero

400

What does this mean? |-6| = 6

The absolute value of -6 is 6, or -6 is 6 units from zero.

500

Subtracting a positive number is the same thing as...

Adding a negative 7-4 = 7 +-4

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 # with the greater absolute value

500

-16+18+-17

-15

Subtracting Integers

100

-4 - 6

-4 + (-6) = -10

200

4 - 11

4 + (-11) = -7

300

15 - (-7)

15 + 7 = 22

400

-27 - (-3)

-27 + 3 = -24

500

-10 - 11 - (-3)

-10 + (-11) + (3)= -18

Word Problems

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

Chris gets paid $100, and then must pay his cable bill which is $245. How much money does he have?

100 - 245 = $-145

300

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

76-12 = 64 degrees

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

Nikkia 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, and deposits 1/4 of it. How much money is in her bank account?

$85

Mixed Review

100

Amaya is making pillows for her Life Skill class. She bought 2 ½ yards of fabric. Her total cost was $15. What was the cost per yard?

$6 per yard

200

8.75 written as a percent

875%

300

GCF of 72 and 102

6

400

Wednesday buys an ornament priced at $85. If the sales tax is 8.5%. How much tax will she pay?

$7.23

500

The price of a pair of shoes increases from $20 to $32. What is the percent of change? Increase or decrease?

60% increase