1. What is Number Addition?

Definition: Addition is one of the four basic arithmetic operations that combines two numbers to form their total or sum.

Purpose: It's fundamental in mathematics and daily life for combining quantities, measuring totals, and solving problems.

2. How Does Addition Work?

The addition operation follows the simple formula:

Where:

• sum — The result of the addition
• a — First number (addend)
• b — Second number (addend)

Explanation: The numbers being added are called addends, and the result is called the sum.

3. Importance of Addition

Details: Addition is the foundation for more complex mathematical operations and is essential in finance, science, engineering, and everyday calculations.

4. Using the Calculator

Tips: Enter any two numbers (positive, negative, or decimal) and click Calculate to see their sum.

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, add them sequentially.

Q2: What about adding negative numbers?
A: The calculator handles negative numbers correctly (e.g., 5 + (-3) = 2).

Q3: How precise are the results?
A: Results are shown with up to 3 decimal places for accuracy.

Q4: Can I add very large numbers?
A: Yes, within the limits of PHP's number handling capabilities.

Q5: Is the order of numbers important?
A: No, addition is commutative (a + b = b + a).