1. Subtraction Operation

The '-' symbol most commonly represents subtraction between two numbers (e.g., 5 - 3 = 2). This is its primary arithmetic function on calculators.

2. Negative Sign

The same symbol can indicate a negative number when placed before a value (e.g., -5). This shows the number is less than zero.

3. How Calculators Differentiate

• Subtraction: Between two numbers (5 - 3)
• Negative: At start of entry or after another operator (-5 or 5*-3)

4. Common Usage Examples

Subtraction: 10 - 4 = 6
Negative numbers: -15 (temperature below zero)
Combined: 5 - (-3) = 8 (subtracting a negative)

5. Frequently Asked Questions (FAQ)

Q1: Why does the same symbol have two meanings?
A: It's a historical convention that simplifies calculator design while remaining intuitive in most contexts.

Q2: How do scientific calculators handle this?
A: Many have separate (-) and +/- keys to distinguish between operations and sign changes.

Q3: Can this cause calculation errors?
A: Yes, if not used properly - especially when subtracting negative numbers.

Q4: Is there a difference in appearance?
A: Some calculators may display negative numbers with a slightly raised minus sign.

Q5: How do I ensure correct interpretation?
A: Use parentheses for clarity, especially with negative numbers in equations.