Math review

Adding & Subtracting Integers

100

-8 + 3

-5

200

-12 - 14

-26

300

-3 + 5 - 6

-4

400

10 + (-3) - 7 + 9

9

500

8 - 12 + 9 + (-3) - 6 + 14 - 2

8

Multiplying & Dividing Integers

100

3 x -8

-24

200

30 ➗ (-5)

-6

300

-12 x (-9)

108

400

10 x 6 ➗ 5

12

500

-3 x (-5) x 4 ➗ 6

10

Discounts & Markups

100

What would be 20% off of $12

$2.40

12 x 0.2 = $2.40

200

What would an 8% sales tax be on a $15 item?

$1.20

15 x 0.08 = $1.20 

300

A backpack costs $55, you use a 20% off coupon. How much does the backpack cost?

$44

55 x 0.2 = $11 off

55 - 11 = $44 total

400

TV's are increasing by 35%. The original price is $1,250. What's the new price of the TV?

$1,687.50

1250 x 0.3 = $437.50 tax

1250 + 375 = $1687.50 total price

500

A laptop costs $1,328. There is a 30% discount on the price of the laptop, and a 7% sales tax on the discount price. What is the final price of the laptop?

$994.67

1328 x 0.3 = $398.40 off

1328 - 398.40 = $929.60 discount price

929.60 x 0.07 = $65.07 tax

929.60 + 65.07 = $994.67 total

Combining like terms

100

4x + 3 + 5x

9x + 3        or      3 + 9x

200

- 8 + 9 + x + 3x

-1 + 4x      or       4x - 1

300

3 (x + 8) - 10

3x + 14      or      14 + 3x

3x + 24 - 10

400

4 (2x - 5) - 5 (x + 6)

3x - 50     or      -50 + 3x

8x - 20 - 5x - 30

500

1/2 (10x + 20) - 1/4 (28 - 40x)

15x + 3    or    3 + 15x

5x + 10 - 7 + 10x

Random

100

What's my favorite soda?

Dr. Pepper

200

Spell my first name

Melanie

300

What room number are we in right now?

314

400

Spell Mr. P's last name

Padmanabhan

500

When's Miss Jones's birthday? (hint: it's in April)

April 30th