Name: ___________________

Date:___________________

kwizNET Subscribers, please login to turn off the Ads!
Email us to get an instant 20% discount on highly effective K-12 Math & English kwizNET Programs!

Grade 8 - Mathematics
2.13 Proportion - II

Example:
The circumference of a circle with a diameter of 4 meters is about 12.56 meters. A circle's circumference is proportional to its diameter. Write an equation relating the circumference of a circle to its diameter. What would be the circumference of a circle with a 5-inch diameter?
The constant of proportionality between circumference and diameter
12.56/4 = 3.14

The circumference is about 3.14 times the diameter.
Let C = circumference and d = diameter.
C = 3.14d = 3.14(5) = 15.7
The circumference is about 15.7 inches

Directions: Choose the correct answer. Also write at least 5 examples of your own.

Name: ___________________

Date:___________________

Grade 8 - Mathematics
2.13 Proportion - II

Q 1: 9:15 = 81:225, are they in proportion?
No
Yes

Q 2: 7:5 = 49:30, are they in proportion?
Yes
No

Q 3: 3:7 = 9:21, are they in proportion?
Yes
No

Q 4: 2:5 = 10:25, are they in proportion?
Yes
No

Q 5: On a map, 3 inches represent an actual distance of 30 miles. If the distance between the two cities on the map is 15 inches, What is the actual distance between them?
80
150
4100

Q 6: John sells 6 ounces chocolate for $2.70, how much does she charge for 10 pounds of chocolate?
72
55
68

Q 7: Find the mean proportional of 20 and 5.
15
10

Q 8: Find the missing quantity of the proportion in 4:5 = ___:25.
15
20

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!


Subscription to kwizNET Learning System costs less than $1 per month & offers the following benefits:

  • Unrestricted access to grade appropriate lessons, quizzes, & printable worksheets
  • Instant scoring of online quizzes
  • Progress tracking and award certificates to keep your student motivated
  • Unlimited practice with auto-generated 'WIZ MATH' quizzes
  • Child-friendly website with no advertisements


© 2003-2007 kwizNET Learning System LLC. All rights reserved. This material may not be reproduced, displayed, modified or distributed without the express prior written permission of the copyright holder. For permission, contact info@kwizNET.com
For unlimited printable worksheets & more, go to http://www.kwizNET.com.