Unlock Hidden Points: ACT/SAT Calculator Strategies Every Student Should Know
One of the biggest misconceptions students have about the ACT and SAT is that calculators are simply for doing arithmetic.
In reality, today's calculators—especially the Desmos graphing calculator on the digital SAT and the TI-84 graphing calculator commonly used on the ACT—can become powerful problem-solving tools that save time, reduce mistakes, and even solve questions students might not otherwise know how to complete.
As an ACT/SAT tutor, I teach students how to think mathematically first, but I also show them how to use their calculator strategically when it makes sense. These backup strategies often become the difference between an average score and an exceptional one.
SAT and Digital ACT Calculator Options
Both the digital SAT and the digital Enhanced ACT now include the built-in Desmos graphing calculator, giving students access to one of the most powerful math tools ever offered on a standardized test. Desmos can graph equations, find intersections, evaluate functions, generate tables, and solve many problems much more efficiently than traditional algebra.
Students taking the SAT or the digital ACT also have the option of bringing an approved handheld calculator if they prefer.
For students taking the paper ACT, an approved handheld calculator is permitted for the entire math section.
Popular approved calculators include:
TI-84 Plus (I recommend this)
TI-83 Series
TI-Nspire (non-CAS)
Most scientific calculators
Most Casio graphing calculators
I strongly recommend that students practice with the exact calculator—or combination of calculators—they plan to use on test day. Becoming fluent with your calculator's features can save valuable time and prevent unnecessary mistakes.
Always Start With the Primary Strategy
Before reaching for calculator shortcuts, students should first determine the primary strategy for solving the problem.
Usually this means:
Setting up the algebra correctly
Solving equations normally
Using mathematical reasoning
Understanding the underlying math builds long-term success.
However...
Many ACT and SAT questions can be solved 100% reliably using backup strategies that often require less work and reduce opportunities for mistakes.
These are some of my favorite techniques to teach.
Backup Strategy #1: Let Desmos Graph It for You
One of the biggest advantages of the digital SAT is the built-in Desmos graphing calculator.
Many students barely scratch the surface of what it can do.
Desmos can help students:
Graph linear equations
Graph quadratic equations
Find intersection points
Locate x-intercepts and y-intercepts
Compare multiple functions
Evaluate complicated expressions
Explore transformations
Verify solutions visually
Many questions that appear difficult become surprisingly simple once students learn how to graph the information.
Learning just a handful of Desmos shortcuts can save valuable time throughout the ACT/SAT.
Backup Strategy #2: Plug In the Answer Choices
Sometimes the fastest solution is to start with the answers instead of solving from scratch.
If the question asks:
"What is the value of x?"
Try each answer choice.
When one satisfies the original equation, you've found the correct answer.
This strategy works especially well for:
Algebra
Rational equations
Absolute value
Exponential equations
Word problems
Remember:
The ACT and SAT are multiple-choice tests.
Use that to your advantage.
TI-84 Strategy #1: Graph the Functions
One of the strongest features of the TI-84 is graphing.
Instead of solving lengthy equations manually, students can often:
Enter both equations
Graph them
Use the Intersect feature
Read the solution directly from the graph
This is particularly useful for:
Systems of equations
Quadratics
Polynomial questions
Function comparisons
Graphing also serves as an excellent way to check answers before moving on.
TI-84 Strategy #2: Evaluate Numerical Expressions
Many ACT questions simply ask students to evaluate a complicated numerical expression.
Rather than risking arithmetic mistakes, students should enter the expression exactly as written.
This strategy works especially well for:
Exponents
Fraction operations
Scientific notation
Nested radicals
Logarithms
Saving mental energy on computation leaves more focus for actual problem solving.
TI-84 Strategy #3: Use the MATH Menu
One of the most underutilized calculator features is the MATH button.
Hidden inside are tools that make many standardized-test questions dramatically easier.
Students can quickly access:
Cube roots
Higher-order roots
Absolute values
Logarithms
Factorials
Probability functions
Summations (Σ notation)
Numerical solvers
One feature I especially emphasize is...
Convert Decimals into Fractions
This is an incredible time saver.
Suppose your calculator gives:
0.375
Instead of trying to recognize the fraction mentally...
Simply use:
►Frac
The calculator instantly converts:
0.375 → 3/8
This feature alone saves students on countless ACT and SAT questions.
Calculator Strategies Save Time—Not Just Points
Many students think calculator tricks are only useful when they don't know the math.
Actually, they're often valuable even when students know exactly how to solve the problem.
Using calculator strategies can:
Reduce arithmetic mistakes
Verify answers
Save valuable time
Increase confidence
Prevent careless errors
Remember:
The ACT and SAT reward correct answers—not elegant solutions.
Know When NOT to Use Your Calculator
Ironically, one of the most important calculator strategies is knowing when to leave it alone.
Some problems can be solved mentally much faster than entering them into a calculator.
A skilled test-taker constantly asks:
"Will the calculator actually save me time here?"
Sometimes the answer is yes.
Sometimes it isn't.
Learning that judgment is an important part of effective ACT/SAT preparation.
Why Personalized Tutoring Makes the Difference
Every student approaches math differently.
Some students need more algebra review.
Others simply need to learn how to use their calculator more effectively.
During tutoring sessions, I teach students:
Which calculator strategies work best for different question types
When backup strategies are faster than traditional algebra
How to combine Desmos, TI-84 shortcuts, and strong mathematical reasoning into one efficient system
These aren't gimmicks—they're practical tools that help students solve problems more confidently and efficiently.
Final Thoughts: Your Calculator Should Be One of Your Biggest Advantages
The calculator is much more than a device for multiplication and division. When used strategically, it becomes one of the most powerful tools available on both the ACT and SAT.
By learning when to graph, when to plug in answer choices, when to create numbers, and how to take advantage of powerful TI-84 and Desmos features, students can solve difficult questions more quickly, more accurately, and with greater confidence.
If you'd like to learn these calculator strategies—and many more—I'd love to help.
Contact me today to get started with expert ACT/SAT tutoring and take the next step toward college success!
