7th Pre-Algebra 2nd Semester Final Review

L 6.1-6.2 & 6.4

100

Express each ratio as a fraction in simplest terms.

12 boys out of 36 students

4/9

200

A statement of equality of two ratios or rates is called:

a proportion

300

Find the unit rate.

300 words in 5 minutes

60:1 or 60 words in 1 minute

400

Are the following set of numbers proportional or non-porportional? If so, what is the rate?

1/3, 2/6, 3/9, 4/12

Proportional, the rate is 1/3

500

Which is a better deal, 15 paper plates for $3.75, or 25 paper plates for $7.50?

15 plates at $3.75 = $.25:1

25 plates for $7.50 = $.33:1

15 plates for $3.75 is the better deal.

L 6.5-6.6

100

Solve the proportion.

30/4 = x/20

x=150

200

Solve the proportion.

6/8 = z/48

z=36

300

If the scale on a drawing is 2cm=3m, how many cm is the drawing of a 12m long wall?

8 cm

2cm/3m = x/12m

400

If 7 gallons of paint are needed to paint 4 classrooms, how many gallons are needed for one classroom?

1.75 gal.

7/4=x/1

500

On the map, the scale is 1in.=20miles.  There are 13 inches between St. Louis & Kansas City on the map.  What is the actual distance?

260 miles

1in/20mi = 13in/X

L6.7 & 6.9

100

Solve for y

6/4=8/y

6y=24

y=4

200

b/30=4/5

5b=120

b=24

300

k/56=12/7

7K=672

K=96

400

A mosaic is created using rectangular blocks. Block A had a length of 5 cm and width of 2.5 cm.  Block B is similar to block A and has a length of 7cm.  What is the width of block B.

2.5/X=5/7

5X=17.5

X=3.5cm

500

A tree casts a shadow of 39 feet when a 4 foot post nearby casts a shadow of 6 feet. Find the height of the tree.

x/39=4/6

6X=26

L7.1-7.3

100

Write the percent as a fraction in simplest form.

140%

1-2/5

200

Write this percent as a decimal.

115%

1.15

300

Use the percent proportion to solve.

What is 63% of 130?

81.9

400

Use the percent proportion.

12 is what percent of 60?

12/60=X/100

60X=1200

X=20%

500

Thirty percent of the CDs that Monique owns are classical. If Monique owns 120 CDs, how many are classical?

X/120=30/100

100X=3600

X=36 CD's

L7.5-7.7

100

Solve using the percent equation.

17 is what percent of 68?

17=68p

25%

200

Use the percent equation to solve.

55 is 20% of what number?

55=.20x

x=275

300

Find percent of change from 60 to 84.

84-60=24

24/60=.4 percent increase

400

Find percent of change from $40 to $32.

32-40=-8

-8/40=-.2=-20% decrease

500

Find the simple interest to the nearest cent.

$1000 at 4.5% for 2 years

I=PRT

($1000)(.045)(2)

I=$90