🧠 How to Use the TI-84 Calculator on the Middle School Math Praxis Test
Hey, teacher bestie! 💛 It’s Robin, your go-to math Praxis bestie, and today I want to show you how to use the TI-84 calculator to boost your confidence (and your score!) on the Middle School Math Praxis 5164 exam.
If you’ve ever looked at a Praxis question and thought, “I wish I knew how to use this calculator better,” this post is for YOU.
Let’s dive in! 👇
🔗 First: Practice Using the TI-84 Online
You don’t need to buy a calculator to practice! There’s a free website where you can use a fully functional TI-84 emulator:
➡️ Go to sagecalc.com
➡️ Click on the link for testsnav.com
➡️ Press Start, then Start again to load the TI-84 calculator
Now you’re ready to practice just like test day!
Watch on YouTube!
🟢 Example 1: Finding Real Zeros with the TI-84
Let’s practice with this question:
How many real zeros does the function
f(x) = x² + 3 have?
- On the TI-84, press the Y= button.
- Type in: x² + 3
- Press Graph.
What do you notice? The graph never crosses the x-axis. That means it has no real zeros, because zeros = x-intercepts.
👉 Answer: 0 real zeros
🔼 Example 2: When Is a Function Increasing?
Try this one:
When is f(x) = x² – x – 12 increasing?
- Go back to Y= and enter: x² – x – 12
- Press Graph
- Use the Trace feature to move along the graph
You’ll see the graph starts increasing after the vertex (the lowest point). This happens when:
👉 x > 0.5 (or x > 1/2)
This kind of question is perfect for visualizing with your calculator!
📊 Bonus: Graphing Systems of Inequalities
You can even use the TI-84 to graph systems of inequalities! Here’s how:
Let’s say you’re given:
- y < –2x + 3
- y ≥ 3x – 1
- Go to Y= and enter the first inequality
- Use the left arrow to access the inequality style (dotted for “<“, solid for “≥”)
- Select the correct shading (below for “<“, above for “≥”)
- Enter the second inequality using the same steps
- Press Graph
You’ll see both shaded regions—and where they overlap is the solution to the system!
🛑 If something looks weird, check your signs—make sure you’re using the negative symbol and not the minus key!
💡 Final Tips
- Use Zoom Standard to reset your graph if it gets messy
- Use Trace to follow your graph and find important values like zeros, minimums, and where it’s increasing or decreasing
- Use this calculator often during practice so you’re comfortable on test day!
✨ You’ve Got This!
I hope this quick tutorial helps you feel confident using the TI-84 for the Praxis Middle School Math Test. If you’re looking for more calculator tips, practice problems, or a complete toolkit for success…
👉 Check out my Ultimate Praxis 5164 Math Toolkit — it’s packed with everything you need to pass with confidence!
📌 Stay tuned for more tips, tricks, and walkthroughs. You’ve got this!
With love,
Robin – Your Math Praxis Bestie
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