1. What is Rounding?

Rounding means reducing the digits in a number while keeping its value close to the original. It simplifies numbers while maintaining reasonable accuracy.

2. How Does Rounding Work?

The calculator uses the PHP round() function formula:

Where:

• \( number \) — The original number to be rounded
• \( decimals \) — Number of decimal places to round to (0-15)

Explanation: Numbers are rounded up if the next digit is 5 or greater, and rounded down if less than 5.

3. Importance of Rounding

Details: Rounding is essential for presenting data clearly, financial calculations, statistical reporting, and when exact precision isn't required.

4. Using the Calculator

Tips: Enter any number and specify how many decimal places you want to round to. The calculator will return the rounded value.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between rounding and truncating?
A: Rounding considers the next digit to decide up/down, while truncating simply cuts off digits without rounding.

Q2: How many decimal places should I use?
A: Typically 2 for currency, 3-4 for scientific work, but depends on your precision needs.

Q3: Does rounding introduce errors?
A: Yes, but usually negligible for most practical purposes when done appropriately.

Q4: What about rounding negative numbers?
A: The same rules apply - the absolute value is rounded, then the sign is reapplied.

Q5: Can I round to whole numbers?
A: Yes, set decimal places to 0 to round to the nearest integer.