8th grade STAAR REVIEW

1. Mrs. Harris wrote the following inequality on the

board during warm-up:

2

9 > x > 12%

Which value of x would make the inequality true?

• 1/9

• 0.3

• √1.5

• 1/5

Answer explanation

The correct value of x that satisfies the given inequality is 1/5. This is because 1/5 falls between 2/9 and 12%, making the inequality true.

Rubio needs to know the volume of the cylindrical

planter he purchased shown below. To calculate the

volume, Rubio will use the formula V = Bh. Which of

the following is the correct value for B rounded to the nearest tenth?

• 7.1 feet square

• 28.3 feet square

• 9.4 feet square

• 18.8 feet square

Answer explanation

The correct value for B rounded to the nearest tenth is 7.1 feet square, as indicated in the answer choices.

3. Georgia is reading at a rate of 2 pages every 5 minutes. Which graph below shows the same unit rate?

• A

• B

• C

• D

Answer explanation

The correct graph should show a unit rate of 2 pages every 5 minutes, which is represented by graph C.

4. The side views of two different ramps are shown

below. Which is a true statement about the slope of the

ramps?

• The slope of ramp A is greater than ramp B.

• The slope of ramp B is greater than ramp A.

• The slope of ramp A is the same as ramp B.

• There is not enough information to compare the

  slopes of ramp A and B.

Answer explanation

The slope of ramp A is the same as ramp B.

The scatter plot below shows the relationship

between the number of pets that people have and the

average amount they spend at the pet store each

month. Based on the equation of the trend line, how

much would you expect someone who has 9 pets to

spend at the pet store each month?

• $200

• $225

• $260

• $300

Answer explanation

Based on the trend line equation, someone with 9 pets would spend $225 at the pet store each month, as indicated by the scatter plot.

Which of the following is a correct representation of the relationship between real numbers, rational numbers

and irrational numbers?

• A

• B

• C

• D

Answer explanation

The correct representation is that real numbers are the union of rational and irrational numbers, meaning every real number is either rational or irrational.

Sheila sells cakes for special occasions. She charges

her customers a one-time design fee plus a rate for

each serving the cake yields. The table shows the cost

of a cake from Sheila based on the number of servings.

Based on the table, what rate does Sheila charge

customers for each serving?

• $2.80

• $2.50

• $2.70

• $3.00

Answer explanation

Based on the table, Sheila charges customers $2.50 for each serving of the cake.

The graph below represents a map of the distance

from Blake’s house to the school.

If each unit on the graph represents 0.75 miles, how

many miles is the diagonal path from Blake’s house to

the school?

• 10 miles

• 15 miles

• 6 miles

• 7.5 miles

Answer explanation

The diagonal path on the graph is equivalent to the hypotenuse of a right triangle. Using the Pythagorean theorem (a^2 + b^2 = c^2), where a = 6 units and b = 8 units, the distance is 7.5 miles (6^2 + 8^2 = c^2, c = 10, 10 * 0.75 = 7.5 miles).

Li is using a cone-shaped cup with a diameter of 7 3/8

cm and a height of 10 cm. Which of the following is the

closest to the total volume of the cup?

• 1707.87 cm³

• 569.29 cm³

• 426.97 cm³

• 142.32 cm³

Answer explanation

The closest volume to the total volume of the cup is 142.32 cm^3, which is the correct choice.

Noah is solving the equation below. Which value of

x makes the equation true?

1/4x – 8 = 1/8x + 8

• 64

• 0

• 128

• 2

Answer explanation

To find the value of x, first combine like terms: 1/4x - 1/8x = 8 + 8. This simplifies to 1/8x = 16. Multiplying both sides by 8 gives x = 128, which makes the equation true.