8th Grade Math STAAR Study Guide

Four students are each trying to raise the same amount of money for a class trip. The table below shows how much of each student’s goal has been met.

Which list shows the numbers in the table in order from least to greatest?

• $0.7,\ 65\%,\ \frac{5}{8},\ \frac{2}{3}$

• $0.7,\ \frac{5}{8},\ 65\%,\ \frac{2}{3}$

• $\frac{5}{8},\ 65\%,\ \frac{2}{3},\ 0.7$

• $\frac{5}{8},\ \frac{2}{3},\ 65\%,\ 0.7$

Which graph shows a proportional relationship between x and y?

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Point M is located at (4, 6) on a coordinate grid. Point M is translated 8 units to the left and 9 units down to create point M′.

Which measurement is closest to the distance between point M and point M′ in units?

• 4 units

• 17 units

• 9 units

• 12 units

Tamara invested $15,000 in an account that pays 4% annual simple interest. Tamara will not make any additional deposits or withdrawals. How much interest will Tamara earn on her investment at the end of 3 years?

• $1,800

• $600

• $450

• $1,873

An aquarium is being filled with water. The graph shows the height of the water over time as the aquarium is being filled.

Which statement best describes the rate of change for this situation?

• The height of the water increases 20 inches per second.

• The height of the water increases 1 inch per second.

• The height of the water increases 5 inches per second.

• The height of the water increases 2.5 inches per second.

In the diagram a person who is 6 ft tall is standing on the ground 3 ft away from point P. A line segment drawn from the top corner of the building to point P creates two similar triangles.

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  $\frac{3}{h}=\frac{18}{6}$
  

• $\frac{6}{3}=\frac{h}{18}$

• $\frac{3}{15}=\frac{h}{6}$

• $\frac{6}{3}=\frac{18}{h}$

Carnival M charges an entrance fee of $5.00 and $0.65 per ticket for the rides. Carnival P charges an entrance fee of $10.00 and $0.45 per ticket for the rides. How many tickets must be purchased in order for the total cost at Carnival M and Carnival P to be the same?

• 25

• 10

• 50

• 75

The coordinate grid shows parallelogram PQRS.

Parallelogram PQRS is rotated 90° clockwise about the origin to create parallelogram P'Q'R'S′. Which rule describes this transformation?

• $\left(x,\ y\right)\rightarrow\left(x,-y\right)$

• $\left(x,\ y\right)\rightarrow\left(-x,\ y\right)$

• $\left(x,\ y\right)\rightarrow\left(y,\ x\right)$

• $\left(x,\ y\right)\rightarrow\left(y,\ -x\right)$

The value of y varies directly with x. When  $y=75,\ x=\frac{1}{2}.$  The value of y varies directly with x. What is the value of y when x is  $2\frac{1}{4}$ ? 

•  $84\frac{3}{8}$  

•  $337\frac{1}{2}$  

•  $16\frac{2}{3}$  

•  $168\frac{3}{4}$  

A triangular prism and its dimensions are shown in the diagram.

What is the lateral surface area of this triangular prism in square centimeters?

• 192 cm²

• 128 cm²

• 152 cm²

• 144 cm²