Chapter 6 Checkpoint Quiz Ratios, Proportions, and Percents
What is 70% of 49?
34.3
How many minutes are in 5 h 45 min?
345
Use prime factorization to find the LCM of 9, 30, 40.
360
A scale model of an airplane is 7.5 inches long. The scale used to make the model is 1 inch: 5 feet. How long is the original airplane?
37.5 feet
Write 74% as a fraction in simplest form.
37/50
How many minutes are in 6 h 20 min?
380
Estimate the quotient: 7 3/4 / 2 1/8.
4
Estimate the quotient: 99 4/5 / 19 5/8
5
Estimate the quotient: 10/ 4 3/4
2
Estimate the quotient: 13 1/2 / 6 6/7
2
Aaron is building a model train set. The rails of his model track are 1.5 inches apart. The actual trains rails are 57 inches apart. The actual locomotive is 76 feet long. How long should Aaron's locomotive be?
2 feet
What is 25% of 81?
20.25
Solve the proportion. x/18 = $6.30/7
$16.20
Two movie tickets cost $7. What is the cost of five tickets?
$17.50
A cereal box is $.19 per ounce. How much does a 15 ounce box cost?
$2.85
Katie estimates 15% of a bill and leaves a $3.00 tip. What is the amount of the bill?
$20.00
Using a sales tax rate of 5%, estimate the sales tax and total cost for a calendar that costs $14.95.
$22.50
Write 74% as a decimal.
0.74
A beverage cup is 6 inches tall. The beverage cup on a restaurant billboard is 18 feet tall. Write the scale as a ratio.
1 inch:3 feet
Benito's digital watch beeps every 30 minutes. How many times does it beep in the month of May?
1,488
Find the product: 5/16 of 32.
10
Find 44% of 250.
110
Solve the proportion. 21/36 = 7/n
12
Use prime factorization to find the LCM of 12, 40.
120
How many minutes are in 2 h 10 min?
130
Find the product: 9/10 x 55
15 4/5
Find 25% of 72.
18
Write 18:40 in two other ways.
18 to 40; 18/40
Use prime factorization to find the LCM of 18, 60.
180
What is 40% of 63?
25.2
Which is the best estimate of 20% of 128?
26
What is 85% of 35?
29.75
Find the product: 3/4 x 10
7 1/2
Use prime factorization to find the LCM of 8, 24, 36.
72
How many minutes are in 1 h 15 min?
75
Solve the proportion. 54/c = 9/13
78
Find the product: 4/5 of 100
80
Write 21/25 as a percent.
84%
Alabama has a 4% sales tax. Mississippi has a 7% sales tax. In Alabama, you can buy a camera on sale for $72.72. In Mississippi, you can buy the same camera for 20% off the regular price of $89.99. At which store would you pay less for a new camera?
Alabama's store
Does the ratio form a proportion? 4/7, 30/42
no
Does the ratio form a proportion? 6/45, 2/18
no
Does the ratio form a proportion? 8/12, 30/45
yes
