Pre-Algebra 8th grade

Equations

100

Solve for x: x + 15 = 85

70

200

Solve for x: x - 15 = -15

110

300

Solve for x: x - 23 = -65

-42

400

Solve for x: -3x - 26 = 160

62

500

Solve for x: 5x - 14 = 3x + 20

17

Proportions

100

There are 3 pigs for every 5 cows. How many pigs are there if there are 100 cows?

60

200

3 feet represents 50 miles... How many miles will 27 feet represent?

450

300

A 25 foot flagpole has a 10 foot shadow. Find the height of a person with a 5 foot shadow.

12.5

400

A model of a 220 foot tall building is 25 inches tall and 10 inches wide. How wide is the actual building?

88 feet

500

A model car is made to a scale of 2 to 25. If the model is 15 in long, how long, in inches, is the actual car?

187.5 in

Integers

100

solve -5 cubed

-125

200

Solve: -3 raised to the fourth power

81

300

Solve: -5 + -20 + 15 =

-10

400

Solve: -100 + 40 + 15 + -30 =

-75

500

Solve: -120 + 50 + -40 + 10 =

-100

Statistics

100

Find the mean: 84, 80, 82

82

200

Find the median: 90, 97, 85, 72

87.5

300

Find the average of 75, 86, 81, 94

84

400

Find the mean of 10, 15, 20

15

500

Find the average of 128, 178, 165, 142

153.25

Percents

100

Find 25% of 200.

50

200

Find 50% of 250.

125

300

Find the sale price on a winter coat regularly priced at $100 and on sale with a 10% discount.

$90

400

If the original price of the shoes are $275, but they are 35% off, what is the sales price of the shoes?

$178.75

500

Candy at the store is buy one, get one 50% off. If the candy costs $2.50, and you buy two with the sale, what is the total cost of two candies?

$3.75