1. What is Addition?

Addition is one of the four basic operations of arithmetic, combining two or more numbers to form their total or sum. It is fundamental to mathematics and daily life calculations.

2. How Does the Calculator Work?

The calculator uses the addition formula:

Where:

• \( a \) — First number
• \( b \) — Second number
• Sum — Result of the addition

3. Importance of Addition

Details: Addition is essential for basic arithmetic, financial calculations, measurements, and many real-world applications from shopping to advanced mathematics.

4. Using the Calculator

Tips: Enter any two numbers (positive, negative, or decimal) and click calculate to see their sum. The calculator handles both whole numbers and decimals.

5. Frequently Asked Questions (FAQ)

Q1: Can I add more than two numbers?
A: This calculator adds two numbers at a time. For multiple numbers, perform calculations sequentially.

Q2: Does the order of numbers matter in addition?
A: No, addition is commutative (a + b = b + a).

Q3: How precise are the calculations?
A: The calculator handles up to 4 decimal places for accurate results.

Q4: Can I add negative numbers?
A: Yes, the calculator handles both positive and negative numbers.

Q5: What's the maximum number I can enter?
A: The calculator handles very large numbers within PHP's floating-point limits.