Cal11 calculator
Search calculator...

How to Put Percentage in Ti 84 Calculator

Reviewed by Calculator Editorial Team

Calculating percentages on your TI-84 calculator is straightforward once you understand the basic operations. This guide will walk you through entering percentages, performing percentage calculations, and using common percentage formulas with your TI-84.

Entering Basic Percentages

To enter a percentage on your TI-84, you have two main methods:

Method 1: Using the Percentage Key

  1. Press the 2nd key and then the % key to enter a percentage symbol (%)
  2. Enter the percentage value (e.g., 25 for 25%)
  3. Press the = key to display the percentage

Method 2: Converting Decimal to Percentage

  1. Enter the decimal value (e.g., 0.25 for 25%)
  2. Press the 2nd key and then the % key to convert to percentage
  3. Press the = key to display the result

Remember that the TI-84 automatically converts percentages to decimals when performing calculations. For example, 25% is stored as 0.25 in memory.

Percentage Calculations

Your TI-84 can perform various percentage calculations:

Calculating a Percentage of a Number

  1. Enter the base number (e.g., 200)
  2. Press the × key
  3. Enter the percentage (e.g., 25 for 25%)
  4. Press the 2nd key and then the % key to convert to decimal
  5. Press the = key to get the result (50)

Finding What Percentage One Number Is of Another

  1. Enter the part number (e.g., 50)
  2. Press the / key
  3. Enter the whole number (e.g., 200)
  4. Press the × key
  5. Press the 2nd key and then the % key
  6. Press the = key to get the percentage (25%)

Percentage Formula: (Part/Whole) × 100 = Percentage

Common Percentage Formulas

Here are some common percentage formulas you can use with your TI-84:

Percentage Increase/Decrease

Percentage Increase: [(New Value - Original Value) / Original Value] × 100

Percentage Decrease: [(Original Value - New Value) / Original Value] × 100

Simple Interest

Simple Interest: Principal × (Rate × Time)

Compound Interest

Compound Interest: Principal × (1 + Rate)^Time - Principal

Worked Examples

Example 1: Calculating 20% of 150

  1. Enter 150
  2. Press ×
  3. Enter 20
  4. Press 2nd %
  5. Press = to get 30

Example 2: Finding What Percentage 40 is of 200

  1. Enter 40
  2. Press /
  3. Enter 200
  4. Press ×
  5. Press 2nd %
  6. Press = to get 20%

Example 3: Calculating 5% Increase on $100

  1. Enter 100
  2. Press ×
  3. Enter 5
  4. Press 2nd %
  5. Press = to get 5 (the increase amount)
  6. Add this to the original amount: 100 + 5 = 105

Troubleshooting Tips

If you're having trouble with percentages on your TI-84:

  • Check your mode: Ensure your calculator is in decimal mode (press MODE and check the first line)
  • Clear errors: If you get an error, press the ON button to clear it
  • Verify your calculations: Double-check each step of your calculation
  • Use parentheses: For complex calculations, use parentheses to ensure proper order of operations

If you're still having issues, consult your TI-84 manual or visit the official TI website for additional resources.

Frequently Asked Questions

How do I enter a percentage on my TI-84?

Press the 2nd key followed by the % key to enter a percentage symbol. Then enter the percentage value and press =.

Can I calculate percentages without using the percentage key?

Yes, you can convert decimals to percentages by pressing 2nd followed by %. For example, 0.25 becomes 25% when you press these keys.

How do I calculate a percentage increase or decrease?

Use the formula [(New Value - Original Value) / Original Value] × 100 for percentage increase or [(Original Value - New Value) / Original Value] × 100 for percentage decrease.

Why does my TI-84 show a percentage as a decimal?

The TI-84 stores percentages as decimals in memory. To display them as percentages, press 2nd followed by %.

How accurate are percentage calculations on my TI-84?

Your TI-84 provides accurate percentage calculations up to its display precision. For most educational purposes, this is sufficient.