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How to Put in Plus or Minus Into A Calculator

Reviewed by Calculator Editorial Team

Understanding how to properly input plus (+) and minus (-) signs into a calculator is essential for accurate mathematical operations. Whether you're using a basic calculator or a scientific one, knowing the correct method ensures you get the right results every time.

Basic Input Methods

The most straightforward way to input plus and minus signs is by using the dedicated buttons on the calculator's keypad. Most calculators have these symbols clearly marked:

Example: Adding and Subtracting

To calculate 5 + 3 - 2:

  1. Press the number 5
  2. Press the + button
  3. Press the number 3
  4. Press the - button
  5. Press the number 2
  6. Press the = button

The result should be 6.

For calculators without dedicated buttons, you can often use the shift or function key in combination with other keys to access these symbols.

Keyboard Shortcuts

If you're using a calculator that accepts keyboard input, you can use these shortcuts:

Symbol Keyboard Shortcut Description
+ Shift + = Plus sign
- - (minus key) Minus sign
± Alt + 2 3 7 (on some keyboards) Plus-minus sign

Note: Keyboard shortcuts may vary depending on your operating system and keyboard layout.

Mobile Devices

On mobile calculators, the process is slightly different:

  1. Tap the number you want to start with
  2. Tap the + or - button
  3. Tap the next number
  4. Tap the = button to see the result

Some mobile calculators have a more advanced interface with a virtual keyboard that includes these symbols.

Common Mistakes

Here are some common errors to avoid when entering plus and minus signs:

  • Using the wrong symbol (e.g., confusing + with ×)
  • Forgetting to press the = button after entering the operation
  • Not clearing the calculator before starting a new calculation
  • Using the decimal point instead of the minus sign

Remember: Always double-check your input before pressing the equals sign to avoid errors.

Advanced Techniques

For more complex calculations, you might need to use parentheses to control the order of operations:

Example: Using Parentheses

To calculate (5 + 3) × 2:

  1. Press the ( button
  2. Press the number 5
  3. Press the + button
  4. Press the number 3
  5. Press the ) button
  6. Press the × button
  7. Press the number 2
  8. Press the = button

The result should be 16.

This ensures that the addition is performed before the multiplication.

Frequently Asked Questions

How do I change a plus to a minus on my calculator?
Most calculators have a change sign button (often marked with ±) that toggles between positive and negative numbers. Press this button after entering your number to change its sign.
Can I use the minus sign for subtraction and the plus sign for addition?
Yes, the plus sign is used for addition and the minus sign is used for subtraction. These are the basic arithmetic operations that most calculators support.
What if I accidentally press the wrong sign?
If you make a mistake, use the clear (C) or all clear (AC) button to reset the calculator and start over. Some calculators also have an undo or backspace function that allows you to correct your input.
Are there any special rules for using plus and minus signs in scientific notation?
In scientific notation, the plus or minus sign is used to indicate the exponent. For example, 2.5 × 10⁻³ means 2.5 multiplied by 10 raised to the power of -3.