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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

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.
Q 1: 3:7 = 9:21, are they in proportion?
No
Yes

Q 2: Find the mean proportional of 20 and 5.
10
15

Q 3: 9:15 = 81:225, are they in proportion?
Yes
No

Q 4: 7:5 = 49:30, are they in proportion?
No
Yes

Q 5: John sells 6 ounces chocolate for $2.70, how much does she charge for 10 pounds of chocolate?
72
68
55

Q 6: Find the missing quantity of the proportion in __:10 = 45:50.
9
7

Q 7: 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?
150
80
4100

Q 8: 2:5 = 10:25, are they in proportion?
No
Yes

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!


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