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Putting Formulas in Calculator for Act

Reviewed by Calculator Editorial Team

Preparing for the ACT Math section requires understanding how to properly input formulas in your calculator. This guide explains the essential techniques for entering formulas accurately and efficiently during the test.

How to Enter Formulas in ACT Calculator

The ACT calculator is a TI-30XS Multiview Scientific Calculator. Here's how to enter formulas correctly:

Basic Formula Entry Steps

  1. Press the appropriate function key (e.g., [2nd] for inverse functions)
  2. Enter the first number or variable
  3. Press the operation key (+, -, ×, ÷, etc.)
  4. Enter the second number or variable
  5. Press the equals (=) key to get the result

Entering Exponents

To enter exponents like x² or x³:

  1. Enter the base number
  2. Press the [x²] or [x³] key
  3. For higher exponents, use the [yˣ] function: [2nd] [yˣ]

Using Parentheses

For complex expressions with multiple operations:

  1. Press the [ ( ] key to open parentheses
  2. Enter the expression inside parentheses
  3. Press the [ ) ] key to close parentheses

Pro Tip

Always double-check your parentheses to ensure they match and are in the correct order. Mismatched parentheses can lead to incorrect calculations.

Common ACT Math Formulas

Here are some frequently used formulas in ACT Math:

Formula Description Calculator Entry
Quadratic Formula x = [-b ± √(b²-4ac)] / 2a [2nd] [QUAD] then enter a, b, c
Distance Formula d = √[(x₂-x₁)² + (y₂-y₁)²] Enter coordinates, then [2nd] [DIST]
Slope Formula m = (y₂-y₁)/(x₂-x₁) Enter coordinates, then [2nd] [SLOPE]
Pythagorean Theorem a² + b² = c² Enter a and b, then [x²] and [+]

Example Calculation

Let's calculate the slope between points (2,4) and (6,12):

  1. Enter 4, then [−], then 12 (for y₂-y₁)
  2. Press [÷]
  3. Enter 2, then [−], then 6 (for x₂-x₁)
  4. Press [=] to get the slope of 2

Troubleshooting Formula Entry

If your calculator isn't working properly, try these solutions:

Common Issues

  • Calculator not turning on: Check batteries and try a different set
  • Incorrect results: Verify all numbers and operations
  • Error messages: Clear memory with [2nd] [CLR] and try again

Practice Tips

  • Use scrap paper to work through problems before entering them
  • Double-check each step of your calculation
  • Practice with the actual calculator before test day

Best Practices for Using Formulas

Follow these tips to maximize your calculator's effectiveness:

  1. Keep your calculator clean and free of smudges
  2. Use the memory functions for complex multi-step problems
  3. Verify your answers by working backward from the options
  4. Practice timing yourself on different problem types

Memory Function Example

To store a value in memory:

  1. Calculate the value you want to store
  2. Press [STO] then [1] to store in memory location 1
  3. Use [RCL] [1] to recall the stored value later

Frequently Asked Questions

Can I use the calculator for all ACT Math problems?
Yes, the calculator is allowed for all problems except those in the Geometry section. You can use it for algebra, trigonometry, and coordinate geometry problems.
What should I do if my calculator malfunctions during the test?
If your calculator stops working, try turning it off and on again. If that doesn't work, you can use the scrap paper provided to work through the problems manually.
How do I clear my calculator's memory?
Press [2nd] [CLR] to clear all stored values and calculations. This will reset your calculator to its default state.
Can I use the calculator for graphing functions?
Yes, the TI-30XS Multiview Scientific Calculator has graphing capabilities. You can use it to visualize functions and their intersections.