Chapter 16

Practicing Sample Mathematical Reasoning Problems

The best way to get ready for the Mathematical Reasoning test is to practice. The problems on this test evaluate your skills in a wide variety of areas, so check out the sample problems in this chapter to help you prepare for all of them. At the end of this chapter, you find detailed answer explanations for you to check your answers.

Record your answers either directly in this book or on a separate sheet of paper, if you think you might want to try these practice questions again at a later date. The Mathematical Reasoning test doesn’t include an Extended Response or Short Answer item, like the other test sections do, so there’s no need for extra sheets of lined paper. (Writing an essay about quadratic equations or the beauty of exponents — now that would be painful.)

Remember, this is just preliminary practice. We want you to get used to answering different types of Mathematical Reasoning questions. Use the complete practice tests in Parts VI and VII to time your work and replicate the real test-taking experience.

Mathematical Reasoning Practice Questions

The following Math practice questions test your knowledge of Mathematical operations and reading skills in Math. Read the items carefully, making sure you understand what’s being asked. You may have to convert some units of measurement to another, but in all cases, they’ll make sense. For example, if you see the measurement for a wall is 120-something high, read the problem carefully because the wall was probably measured in inches and not feet.

1. Vlad is shopping for a new shirt because all the stores are having end-of-season sales. Sam’s Special Shirts offers Vlad 20% off all his purchases while Hardworking Harry’s Haberdashery has a special sale offering five shirts for the price of four. Which is the better deal?

(A) neither

(B) Sam’s Special Shirts

(C) both are the same

(D) Hardworking Harry’s Haberdashery

2. Olga designed a logo consisting of an equilateral triangle in a circle for a new company. She designed it with one vertex of the triangle pointing northeast. The client said she liked the design but preferred that the vertex of the triangle point due south. What rotation would Olga have to perform to satisfy her client?

(A) 90 degrees to the right

(B) 110 degrees to the right

(C) 135 degrees to the left

(D) 135 degrees to the right

3. Solve the following equation for x:

images, if images and images

(A) 12

(B) 11

(C) –12

(D) –11

Question 4 refers to the following table.

Make and Model

Price

Hopper Model A1

$249.99

Vacuous Vacuum Company Model ZZ3

$679.99

Clean-R-Up Special Series

$179.00

Electrified Home Upright

$749.99

Super Suction 101

$568.99

4. Pierre is looking for a vacuum cleaner for his apartment. He is on a limited budget and wants to spend the least he can for his purchase. He has been told by his best friend that spending around the mean amount for a vacuum cleaner will get him an average unit. His father claims that spending about the median amount is the smartest way to get a good deal. image comes the closest to satisfying both criteria.

5. Evaluate the following formula to two decimal places:

images, if images and images

(A) 34.67

(B) 20.40

(C) 22.47

(D) no answer

6. Solve the following equation for images

(A) 12

(B) 3

(C) 4

(D) 5

7. Rachel and Ronda were planning for their first apartment, and they decided to split the required shopping tasks. Rachel was responsible for finding out how much it would cost to carpet their living room, and Ronda was responsible for finding out how much it would cost to paint the walls in the bedroom. What formula would each of them need to use to get an answer that would let them figure out the price for each job?

(A) images

(B) images

(C) images

(D) images

8. Lillian is drawing a scale diagram of her apartment to take with her while shopping for rugs. If she has taken all the measurements in the apartment, what mathematical relationship would she use to draw the scale drawing?

(A) decimals

(B) exponents

(C) ratios

(D) addition

9. Sylvia couldn’t fall asleep one night and got to wondering how much water her bedroom would hold if she filled it to the ceiling. She had previously measured all the walls and knew all the measurements, including length, width, and height. She should use image to calculate how many cubic feet of water would be needed to fill the room.

10. Alvin is drawing a diagram of his room. He has drawn the line representing the floor and is ready to draw the line representing the wall. This line would be ________ to the line representing the floor.

(A) congruent

(B) parallel

(C) similar

(D) perpendicular

11. Aaron wants to paint the floor of his apartment. His living room/dining room is 19 feet by 16 feet, his bedroom is 12 feet by 14 feet, and his hallways are 6 feet by 8 feet. Bowing to pressure from his friends, he has decided not to paint the floor of the kitchen or the bathroom. How many square feet of floor must he paint?

(A) 304

(B) 520

(C) 250

(D) 216

Question 12 refers to the following table.

Week

Calories Consumed Per Week

Weight (Pounds)

Height (Feet/Inches)

1

12,250

125

5 ft. 1.5 in.

2

15,375

128

5 ft. 1.5 in.

3

13,485

128

5 ft. 1.5 in.

4

16,580

130

5 ft. 1.5 in.

5

15,285

129

5 ft. 1.5 in.

12. Alan kept track of his caloric intake, his weight, and his height for a period of five weeks. What conclusion can you draw from his observations?

(A) Eating a lot makes you taller.

(B) Eating more calories will make you gain weight.

(C) Gaining weight will make you taller.

(D) There’s no correlation between the data presented.

13. On Monday, Mary walked 12 blocks. On Tuesday, she walked 10 blocks, and on Wednesday, she walked 14 blocks. If she wants to walk more than her average trip for those three days on Thursday, at least how many blocks must she walk?

(A) 10

(B) 11

(C) 9

(D) 13

14. Hassan has developed a new trick to play on his classmates. He asks them to write down their ages and multiply by 4, divide by 2, then subtract 6, and, finally, add 8. When they tell him the resulting number, Hassan can always tell them their age. If one of his friends tells Hassan the resultant number is 52, how old is he?

(A) 33

(B) 25

(C) 52

(D) 24

Question 15 refers to the following table.

a

b

F

1

2

–16

2

1

–3

3

2

–18

2

3

–35

3

4

x

15. Herman developed the following function to amuse himself: F = 2a + 3b2 – 2ab. He kept track of his results in this table.

Using Herman’s function, what is the value of x?

(A) 53

(B) -82

(C) 88

(D) 30

16. Calvin and Kelvin, carpenters extraordinaire, are building a staircase for their clients, the Coalmans. The stairway is to bridge a space 10 feet high, and the distance from the front of the bottom step to the back of the top step is 14 feet. What is the slope of the stairway to 2 decimal places?

(A) 0.69

(B) 0.70

(C) 0.71

(D) 0.72

Questions 17 and 18 refer to the following information.

April is considering two apartments. They are of equal size except for the bedrooms. Bedroom A is 19 feet by 14 feet, and bedroom B is 17 feet by 16 feet.

17. How many square feet larger is the larger bedroom?

(A) 8

(B) 7

(C) 6

(D) 5

18. April wants an area rug for the larger bedroom that would cover the floor, leaving a space 1 foot from each wall. If the rug had a 1-inch fringe all the way around it, how many feet long would the fringe be?

(A) 58

(B) 29

(C) 85

(D) 55

Questions 19 and 20 refer to the following table, which shows the results Julio got from measuring and interviewing several of his classmates about their heights and birth months.

Month of Birth

Height

March

5 ft. 4 in.

June

5 ft. 6 in.

March

5 ft. 1 in.

January

5 ft. 8 in.

August

5 ft. 5 in.

January

5 ft. 6 in.

19. What month would produce the shortest people according to these measurements?

(A) January

(B) March

(C) June

(D) August

20. From the graph of Julio’s results, what conclusion, if any, can be reached?

(A) No conclusions can be reached.

(B) People born in March are shorter.

(C) People born in the warm months are similar in height.

(D) Two of Julio’s classmates were born in each of January and March.

21. Susie is shopping for a few groceries. She buys a loaf of bread for $1.29 and a half gallon of milk for $1.47. She sees her favorite cheese on sale for $2.07. If she has $5.00 in her purse, can she buy the cheese if there is no tax on food?

(A) unsure

(B) yes

(C) not enough money

(D) not enough information

Question 22 refers to the following table.

Annual Production of the Wonderful World of Widgets

Year

Annual Production (In Million Units)

2013

43

2012

29

2011

72

2010

70

2009

71

22. The general manager of the Wonderful World of Widgets wants to present these figures in a visual, easily understood way to the board of directors to help them understand the effect that the downturn in the economy is having on the production of widgets. What would be the best way to present the figures?

(A) a graph

(B) a series of tables

(C) verbal descriptions

(D) a movie of how widgets are used in America

23. Mark the points images, images, and images on the graph to draw a geometric figure, and identify the figure.

image

© John Wiley & Sons, Inc.

24. Georgio wants to climb a ladder perched beside his house to check the condition of the eaves, which are 22 feet above the ground. For safety, the ladder should be placed 10 feet from the house. The minimum length of ladder he would need to reach the eaves, rounded up to the nearest foot, would be image feet.

25. Where are all the points with an x-coordinate of –4 located on a graph?

(A) 4 units above the x-axis

(B) 4 units to the left of the x-axis

(C) 4 units above the y-axis

(D) 4 units to the left of the y-axis

Question 26 refers to the following table.

Age at Marriage for Those Who Retire at 55 in America

Age

Women

Men

Under 20 years old

27.6%

11.7%

20 to 24 years old

36.6%

38.8%

25 to 29 years old

16.4%

22.3%

30 to 34 years old

8.5%

11.6%

35 to 39 years old

5.1%

6.5%

26. Which of the following must be true, based on the information in this table, in order to ensure retirement at age 55?

(A) Younger women who want to retire at 55 should marry older men.

(B) More men who marry when they are under 20 years old are more likely retire at age 55 than those who marry when they are over 40 years old.

(C) To increase their odds of retirement at age 55, men should marry women who are the same age as they are.

(D) You can’t draw any of these conclusions from this table.

27. The students in a math class are looking at the equation images. The teacher asks what result doubling the length (l) would have on the area (A). What answer is correct?

(A) makes it two times larger

(B) makes it four times larger

(C) makes it three times larger

(D) can’t determine the result without the value of w

28. A wall is 20 feet long and 8 feet high. If all of it is to be painted with two coats of blue paint, how many square feet of wall have to be covered?

(A) 56

(B) 160

(C) 230

(D) 320

29. Where on a graph would the point images be?

(A) four units to the right and four units below the corresponding axis

(B) four units to the left and four units below the corresponding axis

(C) four units to the left and four units above the corresponding axis

(D) four units to the right and four units above the corresponding axis

30. Roger and Ekua went shopping together. Ekua spent twice as much for clothing as Roger did. If their total expenditure for clothing was $90.00, how much did Roger spend for clothing?$ image

Question 31 refers to the following table.

Subject

Height

Shoe Size

1

5 in. 3 ft.

5

2

5 in. 9 ft.

8

3

5 in. 6 ft.

4

6 in. 1 ft.

10

5

5 in. 7 ft.

6

31. Althea has a theory about the men in her class. She has decided that the taller men have larger shoe sizes than the shorter men. To prove her theory, she asked several of the men to measure themselves and tell her their shoe sizes. From her observations, she created the preceding table.

Using her observations, Althea decided to see whether there’s any credibility to her theory. If she calculated the median height of her subjects, what would be the corresponding shoe size?

(A) 5

(B) 6

(C) 8

(D) 10

32. Felix and Francis have just bought new cars. Felix, being American, has a car with a speedometer graduated in customary units. Francis, being Canadian, has a speedometer graduated in metric units. When they’re driving in Felix’s car at a speed of 55 miles per hour and if 1 mile equals approximately 1.6 kilometers, what would Francis’s speedometer read in kilometers per hour (rounded to the nearest number)?

(A) 160

(B) 88

(C) 55

(D) 77

33. The reading on the illustrated meter is image .

image

© John Wiley & Sons, Inc.

Question 34 refers to the following table, which shows Sheila’s marks in her final year of high school.

Subject

Grade (%)

Literature

94

Mathematics

88

Physical Education

86

Science

92

Spanish

90

34. The result on Sheila’s mean grade after a 6-point drop in her Spanish grade would be image.

35. Barry earns $1,730 per month after taxes. Each month, he spends $900 for rent and $600 for living expenses like food and utilities. After all his expenses are paid, he has $image left over to buy luxuries and spend on entertainment.

Questions 36 and 37 refer to the following table.

Car Manufacturer

Sales — July 2013 (In Thousands)

Sales — July 2012 (In Thousands)

% Change

Commonwealth

90

105

–14

Frisky

175

147

+19

Goodenough

236

304

–22

Horsesgalore

99

64

+55

Silkyride

24

16

+50

36. From the table, which car manufacturer showed the greatest percentage increase in sales?

(A) Commonwealth

(B) Frisky

(C) Goodenough

(D) Horsesgalore

37. From the table, which of the following conclusions could be drawn from the data?

(A) Car sales are increasing across the board.

(B) Car sales are decreasing across the board.

(C) Large manufacturers are selling more cars.

(D) No generalization is possible from this data.

Question 38 refers to the following table.

Person Interviewed

Flavor Preference

Chocolate

Vanilla

Strawberry

Peanut

Donalda’s mother

No

No

Yes

No

Donalda’s father

No

No

Yes

No

Donalda’s brother

No

No

No

Yes

Donalda’s sister

No

No

Yes

No

38. Donalda collected the information in the table as part of her research on the most popular flavor of ice cream. After interviewing several subjects and recording her data into the table, she came up with the following conclusions. Which is the most believable?

(A) Nobody likes chocolate ice cream.

(B) Nobody likes vanilla ice cream.

(C) Strawberry ice cream is the most popular flavor in the world.

(D) No conclusion is possible from this data.

Answers and Explanations

  1. C. both are the same. In this case, five shirts for the price of four represents a 20% discount. Consider buying four shirts for $10 each and getting one more free. Your five shirts would cost you $40, or an average price of $8 each, which is 20% off the regular price ($10). Keep in mind that the same prices are often stated in different ways.
  2. D. 135 degrees to the left. If you visualize the equilateral triangle drawn within the circle with one vertex pointing northeast, you can see that the vertex is 45 degrees above the horizontal, which is due east. Due south would be at the halfway point of the circle or at 180 degrees. Simply subtract 45 degrees (the initial position) from 180 degrees (the final position) to discover that the vertex has traveled 135 degrees to the right. To go from due east to due south requires a rotation of 90 degrees to the right. The entire rotation would consist of images to the right. If reading about this problem is confusing, draw it. Diagrams often make problems easier to visualize.
  3. C. images. You can solve this equation by substituting 6 for y and 2 for z, which produces this equation: images.
  4. Super Suction 101. You can calculate the mean price by adding all the prices and dividing the sum by the number of prices: images. To determine the median price, you put all the prices in order; the middle one is the median. In this case, the median is $568.99 because it’s in the middle of the prices: $749.99, $679.99, $568.99, $249.99, and $179.00. The machine that comes closest to satisfying both criteria is the Super Suction 101 because its price is the same as the median. The difference between the price of the Super Suction 101 and the mean price is images. The difference between the price of the Hopper Model A1 and the mean price is images, leaving the Super Suction 101 the clear mathematical winner.

    tip One thing to keep in mind is that the mathematical problems on this test aren’t always reflections of reality. The technique used for buying vacuum cleaners in this question isn’t a reasonable way of buying anything, but it’s a good question because it tests your knowledge of the mean, median, and subtraction.

  5. D. no answer. You can’t find the square root of a negative number, and 2ac will always be larger than a + c, which makes the difference of the two negative.
  6. C. 4. If images, you can subtract 12 from both sides so that images, or images; then divide both sides by 3 to find x, or images. Again, remember the cardinal rule of equations: Whatever you do to one side, you must do to the other.
  7. B. images. In each case, Rachel and Ronda have to calculate the area of the space they’re dealing with to get a price for the carpet and the paint. The formula for area is images.
  8. C. ratios. A scale drawing involves representing one dimension with a smaller one while keeping the shape of the room the same. Lillian may have decided to represent 1 foot in real life by 1 inch on her drawing (a ratio of 1 foot to 1 inch), resulting in a 12-foot wall being represented by a 12-inch line. Not all the answers are mathematical relationships and would have to be excluded immediately.
  9. multiplication. The formula to calculate the volume of a room is to multiply the length by the width by the height. (On the GED test, the formula for calculating volume is listed on the formula sheet.)
  10. D. perpendicular. The line is perpendicular because walls are perpendicular to floors (if they weren’t, the room would probably collapse).
  11. B. 520. To find the total area, you must multiply the length by the width for each area. The area of the living room/dining room is images square feet, the area of the bedroom is images square feet, and the area of the hallway is images square feet. The total area is the sum of the room areas or images square feet.
  12. B. Eating more calories will make you gain weight. The more Alan ate, the heavier he became (which represents a possible causal relationship). The table provides no basis for the other answers.

    If two values change in tune with each other, they have a correlating relationship. For example, there’s a positive correlation between height and age during the teenage years. In other words, you get taller as you get older. If one event leads to another or causes another, the events form a causal relationship. For example, eating all the red jellybeans alters the percentage of orange jellybeans in a mixture of equal numbers of each color because eating a red jellybean removes it from the pool of jellybeans, which originally had the same number of each color. As a result, the percentage of orange jellybeans increases.

  13. D. 13. Mary’s average trip for those three days was images blocks. To beat her average, she has to walk 13 blocks on Thursday. If she walks 12 blocks, she will equal (not beat) her average trip. All the other answers are less than her average.
  14. B. 25. Hassan knows that multiplication and division are opposite operations, which means that multiplying by 4 and dividing by 2 produces a number twice the original. Addition and subtraction are opposites, too, so subtracting 6 and adding 8 results in a number 2 larger than the original. If the number Hassan’s friend tells him is 52, Hassan simply has to subtract 2 from the resultant number (52) and divide by 2, giving him an answer of 25. Or Hassan could start with 52 and then work backward (first subtracting 8 then adding 6 and so on) through the directions to arrive at the correct answer.
  15. D. 30. Using Herman’s function, images.
  16. C. 0.71. To calculate the slope, you have to divide the rise by the run. That is images, or 0.71 to 2 decimal places.

    tip The slope of a line is rise over run. Thus, the slope of a stairway is equal to the distances above the floor of the last step over the distance from the front of the first step to the back of the top step.

  17. C. 6. The area of Bedroom A is images square feet. The area of Bedroom B is images square feet. Bedroom B is larger by images square feet.
  18. A. 58. The measure of the fringe is the perimeter of the rug. Because the rug would cover the floor 1 foot in from each wall, the length of the rug would be images feet, and the width would be images feet. The reason you have to subtract 2 from each measurement is that the rug would be 1 foot from each wall, resulting in a rug that was 2 feet shorter than the room in each dimension. images, where l is the length and w is the width, so the perimeter of the images feet.
  19. B. March. March would produce the shortest person according to the table of observations. With so few subjects, none of them random, this would never be considered a real theory but a bit of mathematical fun.
  20. D. Two of Julio’s classmates were born in each of January and March. The only conclusion that can be reached from such a small sample is about the number of his classmates who were born in each month.
  21. B. yes. The simplest way to solve this problem is to add the cost of the bread and milk to get $2.76, and then add the price of the cheese ($2.07) to get a total of $4.83, which is less than $5.00. You can also estimate the result by using approximations and adding $1.30 and $1.50 to get $2.80, and then adding $2.10 for the cheese for a total of $4.90, which is less than $5.00. Using approximations can help you answer some questions quickly and give you an idea of whether an answer you achieved using a calculator makes sense.
  22. A. a graph. A graph is a visual representation of data; it’s easily understood and can be used to compare data visually. You could use some of the other choices to represent the data, but they would all be more complex than a graph.
  23. Because there are only three points on the graph, the figure is a triangle.
    image

    © John Wiley & Sons, Inc.

    tip Be prepared to draw graphs from data presented, but always remember that the only way to draw a graph for a question on this test is to use a coordinate-plane grid, which has size limitations. Always be sure that your graph makes sense. If the trend is declining, the graph should be headed downward toward the x-axis (horizontal axis). Negative values always appear on the left side of the y-axis (vertical axis) or below the x-axis.

  24. 25. You can represent a ladder perched against a house by a right-angled triangle with the vertical height of 22 feet and a base of 10 feet. The ladder represents the hypotenuse of the triangle. To calculate the length of the ladder, you have to use the Pythagorean theorem. If you represent the length of the ladder as images, because you want the ladder to be long enough to reach the wall, the length has to be rounded up to 25 feet.

    remember Pythagoras, a Greek mathematician, proved that the square of the hypotenuse of a right-angled triangle is equal to the sum of the squares of the other two sides. The hypotenuse is the side opposite the right angle. You find the Pythagorean theorem on the formula sheet you get with your test, so don’t forget to check it for important information you may need as you work through the questions.

  25. D. 4 units to the left of the y-axis. All points with x-coordinates that are negative are located to the left of the y-axis (the vertical axis). Therefore, if a point has an x-coordinate of images, it’s located on a line 4 units to the left of the y-axis.
  26. D. You can’t draw conclusions from this table. This table is a compilation of statistics and reflects the situation as of the date the statistics were gathered. You can’t realistically draw conclusions from this type of data, except to state things such as, “5.1 percent of women who marry at ages 35 to 39 were able to retire at 55.” Just because someone presents you with a table of data doesn’t mean you can draw general conclusions from it.
  27. A. makes it two times larger. In this linear equation, any multiple of one term results in the same multiple of the answer. Multiplying l by 2 results in multiplying A by 2.

    remember As you prepare for the Mathematical Reasoning section of the GED test, you definitely want to remember this rule about equations: Whatever you do to one side, you must do to the other side.

  28. D. 320. The area of the wall is 20 × 8 = 160 square feet. Each coat requires that you paint 160 square feet, but because you have to paint two coats, the answer is 2 × 160 = 320. If your first choice for the answer was Choice (B), you forgot about the second coat of paint. If you picked Choice (A), you confused perimeter with area. Remember that perimeter is the distance all the way around an object — in this case, images. Choice (C) is the correct answer with the first two digits reversed (in other words, it’s a reminder to check your answers carefully!). Reversing digits under the stress of time limits isn’t impossible or unusual.
  29. B. four units to the left and four units below the corresponding axis. Because both coordinates are negative, the point would have to be the corresponding distance to the left and below the corresponding axis.
    image

    © John Wiley & Sons, Inc.

  30. 30.00. If you use x to represent the amount of money Roger spent, the amount of money that Ekua spent is 2x. You can represent their total spending by the equation images or images, in which case images. So Roger spent $30.00 for clothing.
  31. B. 67. In order to figure out the corresponding shoe size, you have to calculate the median heights of the subjects. In order to do that, you have to convert all heights into inches.

    Subject

    Height (inches)

    Shoe Size

    1

    63

    5

    2

    69

    8

    3

    66

    4

    73

    10

    5

    67

    6

    The median is 67 inches (middle value of values in order).

    The shoe size that corresponds to the median height is 6. It is worth noting that Althea doesn’t have a statistically significant theory because her sample is too small and not random. Statistics can be useful but not if they are not properly gathered.

  32. B. 88. Because images. The speeds are both in units per hour, so images.
  33. 1,483. Read the gauge carefully to find the answer.
  34. 88.8. The mean mark with Sheila’s grade in Spanish falling 6 points would be images.
  35. 230. Barry spends images for rent and living expenses. He has images left over.
  36. D. Horsesgalore. The greatest percentage increase was Horsesgalore with a 55% increase in sales.
  37. D. No generalization is possible from this data. From the data given, no generalization is possible; some big manufacturers have rising sales, and some have falling sales. This fact eliminates the first three choices.
  38. D. No conclusion is possible from this data. The sample Donalda used is too small and possibly biased because the subjects are all related. A proper sample in an experiment is selected randomly. Because the data is from a biased sample, no conclusions can be drawn from the results.