1. 8th Grade Mathematics OAA Practice
Created by Educational Technology Network

2. Graphing
Measures/Angles
Forumlas
Probability
Misc. 10 10 10 10 10 20 20 20 20 20 30 30 30 30 30 40 40 40 40 40 50 50 50 50 50

3. Graphing – 10 Points QUESTION: ANSWER:
Zack conducted a survey in his school. He asked each student to choose his or her favorite subject. Zack wants to create a graph showing the percentage of students who chose each subject as their favorite. Which type of graph would best represent these data?
Stem and Leaf Plot
Circle Graph
Line Graph
ScatterPlot
ANSWER:
(Circle Graph)

4. Graphing– 20 Points QUESTION: ANSWER:
What is the slope of a line passing through the points (1,3) and (5,0)?
-4/3
-3/4
4/3
ANSWER:
(-3/4)

5. Graphing – 30 Points QUESTION: ANSWER:
A biologist is collecting data about butterflies. What data represents discrete data?
A. The age of a butterfly over its lifespan.
B. The weight of a butterfly over its lifespan.
C. The temperature over a day in the case in which the butterflies are stored.
D. The number of butterflies collected each day over a month.
ANSWER:
(D. The number of butterflies collected each day over a month.)

6. Graphing– 40 Points QUESTION: ANSWER:
Each Friday, Julie’s track club runs two miles. The graph shows the amount of time that it takes Julie to run the 2 miles each week over a period of 20 weeks. Which describes the relationship between the number of weeks Julie practices and her running time?
A. Julie is running at a slower rate each week.
B. Julie decreases her time by about 20 seconds each week.
C. Julie decreases her time by about one minute each week.
D. Julie is likely to run the 2 miles in12 minutes during the 21st week.
ANSWER:
(C. Julie decreases her time by about one minute each week.)

7. Graphing– 50 Points QUESTION: ANSWER:
The president of a company is comparing employees’ ages in two departments: design and sales. The stem-and-leaf plots show the ages of the employees in each department. Which statement is true about the median and the mode of employees’ ages in each department?
Design Department Sales Department
A. The median and the mode of the employees’ ages in the design department are both greater than in the sales department.
B. The median and the mode of the employees’ ages in the sales department are both greater than in the design department.
C. The median of the employees’ ages is greater in the design department, but the mode of the employees’ ages is greater in the sales department.
D. The median of the employees’ ages is greater in the sales department, but the mode of the employees’ ages is greater in the design department.
ANSWER:
(D. The median of the employee’s ages is greater in the sales department, but the mode of the employees’ ages is greater in the design department.)

8. Measures/Angles– 10 Points
QUESTION:
If m∠A = 41°, what is m∠B?
ANSWER:
(49 Degrees)

9. Topic 2 – 20 Points QUESTION: ANSWER:
What is the supplement of an angle that measures 22°?
ANSWER:
(158 degrees)

10. Topic 2 – 30 Points QUESTION: ANSWER:
Solve for x, given that AB is congruent to BC. Is the triangle equilateral?
A. 3; yes
B. 4; no
C. 3; no
D. 4; yes
ANSWER:
(A. 3; yes)

11. Topic 2 – 40 Points QUESTION: ANSWER:
Which figures appear to be congruent?
A. B and C
B. A and D
C. A and C
D. B and D
ANSWER:
(B. A and D)

12. Topic 2 – 50 Points QUESTION:
A. Only two of the three vertical bars can be parallel.
B. Alternative interior angles converse
C. If two lines are parallel to the same line, then they are parallel to each other.
D. In a plane, if two lines are perpendicular to the same line, then they are parallel to each other.
ANSWER:
(C. If two lines are parallel to the same line, then they are parallel to each other. )

13. Topic 3 – 10 Points QUESTION: ANSWER:
A rectangle has a length of 8 centimeters and a width of 3 centimeters. Find the area.
ANSWER:
(Area = 24 cm-squared)

14. Topic 3 – 20 Points QUESTION: ANSWER:
If the diameter of a circle is mm, then what is the radius?
ANSWER:
(71.4 mm)

15. Topic 3 – 30 Points QUESTION: ANSWER:
Find the circumference of a circle with a diameter of 7.5 inches.
ANSWER:
(C = inches)

16. Topic 3 – 40 Points QUESTION: ANSWER:
Find the volume of this cylinder.
ANSWER:
( cm -cubed)

17. Topic 3 – 50 Points QUESTION: A. 100 square units B. 128 square units
C. 150 square units
D. 80 square units
ANSWER:
(B. 128 square units)

18. Topic 4 – 10 Points QUESTION: ANSWER:
Of the 12 clients at Spencer's salon, 4 of them have red hair. What is the probability that a randomly selected client at Spencer's salon has red hair? Simplify your answer and write it as a fraction or whole number.
ANSWER:
(1/3)

19. Topic 4 – 20 Points QUESTION: ANSWER:
At a buffet restaurant, the sundae station offers 5 different toppings. In how many different orders can they be arranged along the station?
ANSWER:
(120)

20. Topic 4 – 30 Points QUESTION: ANSWER:
You roll a 6-sided die two times.
What is the probability that you will roll an odd number less than 2? Simplify your answer and write it as a fraction or whole number.
ANSWER:
(1/12)

21. Topic 4 – 40 Points QUESTION: ANSWER:
A glass jar contains 6 red, 5 green, 8 blue and 3 yellow marbles. If a single marble is chosen at random from the jar, what is the probability of choosing a red marble? (Simplify your answer).
ANSWER:
(3/11)

22. Topic 4 – 50 Points QUESTION: ANSWER:
Two dice are rolled, find the probability that the sum is equal to four.
ANSWER:
(3/36 or 1/12)
Three possible outcomes give a sum equal to 4: E = {(1,3),(2,2),(3,1)}

23. Topic 5 – 10 Points QUESTION: ANSWER:
Jason is traveling at an average rate of 55 miles per hour. He began driving at 10:30 a.m. and will travel a total distance of 248 miles. Jason does not make any stops.
ANSWER:
(Around 3:00 p.m.)

24. Topic 5 – 20 Points QUESTION: ANSWER:
What is the length of the missing leg?
ANSWER:
(7.4 cm)

25. Topic 5 – 30 Points
QUESTION:
Solve for x.
ANSWER:
(x = 9)

26. Topic 5 – 40 Points
QUESTION:
What is 30% of 1044
ANSWER:
(313.2)

27. Topic 5 – 50 Points QUESTION: ANSWER:
Omar has $60 in a savings account. The interest rate is 5% per year and is not compounded. How much will he have in 5 years?
Use the formula i = prt, where i is the interest earned, p is the principal (starting amount),r is the interest rate expressed as a decimal, and t is the time in years.
ANSWER:
($75)