 # TRUNC

In this comprehensive guide, we will explore the TRUNC function in Excel, which is used to truncate a number to a specified number of decimal places. This function is particularly useful when you want to remove the decimal portion of a number without rounding it. We will cover the syntax, examples, tips and tricks, common mistakes, troubleshooting, and related formulae for the TRUNC function.

## TRUNC Syntax

The syntax for the TRUNC function in Excel is as follows:

TRUNC(number, [num_digits])

Where:

• number (required) – The number you want to truncate.
• num_digits (optional) – The number of decimal places to which you want to truncate the number. If omitted, it defaults to 0, which means the function will truncate the number to an integer.

## TRUNC Examples

Let’s look at some examples of using the TRUNC function in Excel:

Example 1: Basic usage of TRUNC

Suppose you have the number 3.14159 and you want to truncate it to an integer. You can use the TRUNC function as follows:

=TRUNC(3.14159)

This will return the value 3, as the function truncates the decimal portion without rounding.

Example 2: Truncating to a specific number of decimal places

If you want to truncate a number to a specific number of decimal places, you can provide the num_digits argument. For example, if you want to truncate the number 3.14159 to two decimal places, you can use the following formula:

=TRUNC(3.14159, 2)

This will return the value 3.14, as the function truncates the number to two decimal places without rounding.

Example 3: Truncating a negative number

The TRUNC function can also be used with negative numbers. For example, if you want to truncate the number -3.14159 to an integer, you can use the following formula:

=TRUNC(-3.14159)

This will return the value -3, as the function truncates the decimal portion without rounding.

## TRUNC Tips & Tricks

Here are some tips and tricks to help you get the most out of the TRUNC function in Excel:

1. Remember that the TRUNC function does not round the number. If you need to round a number to a specific number of decimal places, consider using the ROUND function instead.
2. If you want to truncate a number to a specific number of significant digits, you can use a combination of the TRUNC and LOG10 functions. For example, to truncate the number 1234.5678 to three significant digits, you can use the following formula:

=TRUNC(1234.5678, 3 – 1 – INT(LOG10(ABS(1234.5678))))

3. When working with large datasets, the TRUNC function can help improve calculation performance by reducing the number of decimal places in your data.

## Common Mistakes When Using TRUNC

Here are some common mistakes to avoid when using the TRUNC function in Excel:

1. Using TRUNC when you need to round a number. Remember that TRUNC only removes the decimal portion of a number without rounding. If you need to round a number, use the ROUND function instead.
2. Forgetting to provide the num_digits argument when you want to truncate a number to a specific number of decimal places. If you omit the num_digits argument, the TRUNC function will truncate the number to an integer.

## Why Isn’t My TRUNC Function Working?

If you’re having trouble with the TRUNC function in Excel, consider the following troubleshooting tips:

1. Check your formula for any syntax errors, such as missing parentheses or incorrect argument separators (commas).
2. Ensure that you’re using the correct function for your needs. If you need to round a number instead of truncating it, use the ROUND function.
3. Make sure that the num_digits argument is set correctly. If you want to truncate a number to a specific number of decimal places, you need to provide the num_digits argument.

## TRUNC: Related Formulae

Here are some related formulae that you might find useful when working with the TRUNC function in Excel:

1. ROUND: Rounds a number to a specified number of decimal places. Syntax: ROUND(number, num_digits)
2. ROUNDDOWN: Rounds a number down to a specified number of decimal places. Syntax: ROUNDDOWN(number, num_digits)
3. ROUNDUP: Rounds a number up to a specified number of decimal places. Syntax: ROUNDUP(number, num_digits)
4. INT: Rounds a number down to the nearest integer. Syntax: INT(number)
5. FLOOR: Rounds a number down to the nearest multiple of a specified factor. Syntax: FLOOR(number, significance)

By understanding the TRUNC function and its related formulae, you can effectively manipulate and analyze numerical data in Excel. Remember to consider the tips and tricks, common mistakes, and troubleshooting advice provided in this guide to ensure that you’re using the TRUNC function correctly and efficiently.

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