1. What is Addition and Subtraction?

Addition and subtraction are the most fundamental arithmetic operations. Addition combines numbers to find their total, while subtraction finds the difference between numbers.

2. How Does the Calculator Work?

The calculator performs simple arithmetic operations:

Where:

• \( a \) — First number
• \( b \) — Second number

3. Importance of Basic Arithmetic

Details: Addition and subtraction form the foundation for all mathematical operations and are essential for daily calculations in finance, science, engineering, and everyday life.

4. Using the Calculator

Tips: Enter any two numbers and select the operation you want to perform. The calculator supports both whole numbers and decimals.

5. Frequently Asked Questions (FAQ)

Q1: What's the maximum number this calculator can handle?
A: The calculator can handle numbers within PHP's floating-point range (approximately ±1.8e308 with 14-15 digit precision).

Q2: How many decimal places does it show?
A: Results are rounded to 2 decimal places for clarity.

Q3: Can I use negative numbers?
A: Yes, the calculator works with both positive and negative numbers.

Q4: What happens if I subtract a larger number from a smaller one?
A: You'll get a negative result, which is mathematically correct.

Q5: Can I add more than two numbers?
A: This calculator is designed for two numbers at a time. For multiple numbers, you would need to perform sequential calculations.