7th Grade Review

Mean

100

What is the mean (average) of this data set:

4, 6, 2 

4

200

What is the mean (average) of this data set:

10, 3, 6, 4, 12, 1

6

300

125, 3, 8, 7, 56, 18, 14, 8

29.875

400

65, 75, 13, 49, 21, 8, 78, 36

43.125

500

5, 14, 5, 23, 5, 9, 5, 19, 2, 5, 31, 5

10.6

Grab Bag

100

Write this decimal as a fraction: 

0.22

22/100 = 11/50

200

Write this fraction as a decimal: 

3/4

0.75

300

Solve:

-3 + y = -5

y = -2

400

Solve: 

4 + (-7) = x 

x = -3

500

Simplify: 

5x³ + 3y + 7x³ - 2y - 4x²

12x³ + y - 4x² 

Solve for X

100

x/7 = 6

x = 42

200

x/10 = 3

x = 30

300

x - 55 = 12

x = 77

400

x + 12 = 35

x = 23

500

x + 48 = 102

x = 54

PEMDAS

100

12 + 7 x 4 

40

200

(5 + 3) - 2 x 4

0

300

9 - 3 x 6 + 8 x 3

32

400

12 + (8 x 2) - 7 x 1

x = 21

500

6 - 2 (3 x 8) + 14 / 7 -1

43

Proportions

100

Determine whether the ratios are proportional: How do you know? 

2/7, 6/21

Yes

200

Determine whether the ratios are proportional: How do you know? 

8/24, 6/20

No

300

Find the unit rate: 

226 miles on 12 gallons

18.83 gallons

400

Solve: 

0.92/1 = m/3

m = 2.76

500

Use cross products to solve each proportion: 

4/36 = x/180

x = 20