10 Most Common 8th Grade STAAR Math Questions
Preparing students for the 8th Grade STAAR Math test? Want a preview of the most common mathematics questions on the 8th Grade STAAR Math test? If so, then you are in the right place.
The mathematics section of the 8th Grade STAAR can be a challenging area for many test-takers, but with enough patience, it can be easy and even enjoyable!
Preparing for the 8th Grade STAAR Math test can be a nerve-wracking experience for some students. Learning more about what they’re going to see when they take the 8th Grade STAAR can help to reduce those pre-test jitters. Here’s a chance to review the 10 most common 8th Grade STAAR Math questions to help your students know what to expect and what to practice most. Let your students try these 10 most common 8th Grade STAAR Math questions to hone their mathematical skills and to see if their math skills are up to date on what’s being asked on the exam, or if they still need more practice.
Make sure to follow some of the related links at the bottom of this post to get a better idea of what kind of mathematics questions students need to practice.
The Absolute Best Book to Ace 8th Grade STAAR Math Test
10 Sample 8th Grade STAAR Math Practice Questions
A chemical solution contains \(4\%\) alcohol. If there is \(24 ml\) of alcohol, what is the volume of the solution?
\(240 ml\)
\(480 ml\)
\(600 ml\)
\(1200 ml\)
Show answer and explanation
C
\(4\%\) of the volume of the solution is alcohol. Let \(x\) be the volume of the solution.
Then: \(4\%\) of \(x = 24 ml ⇒ 0.04 x = 24 ⇒ x = 24 ÷ 0.04 = 600\)
What is the area of the shaded region?
\(31\)
\(40\)
\(64\)
\(80\)
Show answer and explanation
B
Use the area of a rectangle formula \((s = a × b)\).
To find the area of the shaded region, subtract the smaller rectangle from the bigger rectangle.
\(S_{1} – S_{2} = (10 ft × 8ft) – (5ft × 8ft) ⇒ S_{1} – S_{2} = 40ft\)
A \($40\) shirt now selling for \($28\) is discounted by what percent?
\(20 \%\)
\(30 \%\)
\(40 \%\)
\(60 \%\)
Show answer and explanation
B
Use the formula for Percent of Change
\(\frac{New \space Value-Old \space Value}{Old \space Value}× 100 \%\)
\(\frac{28-40}{40}× 100 \% = –30 \% \)(negative sign here means that the new price is less than old price).
How much interest is earned on a principal of \($5000\) invested at an interest rate of \(5\%\) for four years?
\($250\)
\($500\)
\($1000\)
\($2000\)
Show answer and explanation
C
Use the simple interest formula:
\(I=prt\)
(I = interest, p = principal, r = rate, t = time)
\(I=(5000)(0.05)(4)=1000\)
A swimming pool holds \(2,000\) cubic feet of water. The swimming pool is \(25\) feet long and \(10\) feet wide. How deep is the swimming pool?
Write your answer in the box below. ________
Show answer and explanation
8
Use the formula of a rectangular prism.
\(V = (length) (width) (height) ⇒ 2000 = (25) (10) (height) ⇒
height = 2000 ÷ 250 = 8\)
The price of a car was \($20,000\) in \(2014\), \($16,000\) in \(2015\) and \($12,800\) in \(2016\). What is the rate of depreciation of the price of a car per year?
\(15 \%\)
\(20 \%\)
\(25 \%\)
\(30 \%\)
Show answer and explanation
B
Use this formula: Percent of Change
\(\frac{New \space Value-Old \space Value}{Old \space Value}× 100 %\)
\(\frac{16000-20000}{20000}× 100 % \)
\(= 20 \% \space and \space \frac{12800-16000}{16000}× 100 \% = 20 \%\)
What is the area of the shaded region if the diameter of the bigger circle is \(12\) inches and the diameter of the smaller circle is \(8\) inches.
\(16 π\)
\(20 π\)
\(36 π\)
\(80 π\)
Show answer and explanation
B
To find the area of the shaded region, subtract the smaller circle from the bigger circle.
\(S_{bigger}-S_{smaller} =π(r_{bigger})^2 -π(r_{smaller})^2⇒S_{bigger}-S_{smaller}=π(6)^2-π(4)^2\)
\(⇒ 36 π – 16π = 20 π\)
What is the area of an isosceles right triangle that has one leg that measures \(6 cm\)? _________
Show answer and explanation
18
\(a = 6 ⇒\) area of the triangle is:
\(\frac{1}{2}(6×6)=\frac{36}{2}=18 \space cm^2\)
A taxi driver earns \($9\) per \(1\)-hour work. If he works \(10\) hours a day and in \(1\) hour he uses \(2\)-liters petrol with price \($1\) for \(1\)-liter. How much money does he earn in one day?
\($90\)
\($88\)
\($70\)
\($60\)
Show answer and explanation
C
\($9×10=$90\)
Petrol use: \(10×2=20 \space liters\)
Petrol cost: \(20×$1=$20\)
Money earned: \($90-$20=$70\)
What is the solution of the following system of equations?
\(\frac{-x}{2}+ \frac{y}{4} = 1\)
\(\frac{-5y}{6}+ 2x = 4\)
\(x=48,y=22 \)
\(x=50,y=20\)
\(x=20,y=50\)
\(x=22,y=48\)
Show answer and explanation
D
\(\frac{-x}{2}+ \frac{y}{4} = 1\)
\(\frac{-5y}{6}+ 2x = 4\)
Multiply the top equation by \(4\). Then,
\(-2x+ y = 4\)
\(\frac{-5y}{6}+ 2x = 4\)
Add two equations.
\(\frac{1}{6}y=8→y=48\), plug in the value of y into the first equation →\(x=22\)
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