1. Subtraction Operation

The primary meaning of '-' on a calculator is subtraction between two numbers. For example, entering "5 - 3" would yield 2.

2. Negation Operation

When used before a single number, '-' negates the value. For example, entering "-5" makes it negative five.

3. Calculator Implementation

Most calculators have two separate buttons: a subtraction button (typically between numbers) and a negative/positive toggle button (often marked as "+/-").

4. Mathematical Context

In mathematics, '-' can represent:

• Subtraction: a - b
• Negative numbers: -x
• The additive inverse: -a is the number that when added to a gives zero

5. Frequently Asked Questions (FAQ)

Q1: Is there a difference between the subtraction and negative sign?
A: Mathematically they're the same operation, but calculators often implement them differently.

Q2: How do I enter a negative number on a calculator?
A: Either use the "+/-" button after entering the number, or press the "-" key before entering the number.

Q3: Can '-' mean anything else on calculators?
A: In scientific calculators, it might be part of other symbols (like ±), but generally just means subtraction or negation.

Q4: Why do some calculators show subtraction differently?
A: Some calculators use a shorter '-' for subtraction and longer '−' for negative numbers in the display.

Q5: How does this work in calculator programming?
A: Calculators typically treat unary '-' (negation) differently from binary '-' (subtraction) in their parsing.