Round numbers using different methods: round half up, round half down, round half even, and truncate. Compare all methods at once.
| Method | Result |
|---|
Round half up rounds to the nearest number, and when the digit is exactly halfway (5), it rounds up. For example, 2.5 rounds to 3. This is the most common rounding method taught in schools.
Round half down rounds to the nearest number, but when the digit is exactly halfway (5), it rounds down. For example, 2.5 rounds to 2. This is less common but useful in specific applications.
Round half even rounds to the nearest even number when the digit is exactly halfway. For example, 2.5 rounds to 2, but 3.5 rounds to 4. This reduces bias in statistical calculations and is the default in many programming languages.
Truncate simply cuts off the decimal places without rounding. For example, 2.9 truncated to 0 decimal places is 2. It always rounds toward zero, regardless of the decimal value.
Use round half up for most everyday situations. Use round half even for statistical work to minimize bias. Use truncate when you need to simply remove decimal places without rounding. Choose based on your specific requirements.
