# Cleansing numbers

### In this section

* [Formatting phone numbers](https://help.qlik.com/talend/en-US/data-preparation-user-guide/8.0/formatting-phone-numbers)
* [Extracting phone number information](https://help.qlik.com/talend/en-US/data-preparation-user-guide/8.0/extracting-phone-number-information)
* [Changing the number format](https://help.qlik.com/talend/en-US/data-preparation-user-guide/8.0/changing-number-format)
* [Custom number patterns](https://help.qlik.com/talend/en-US/data-preparation-user-guide/8.0/custom-number-patterns)
* [Extracting the numbers contained in a column](https://help.qlik.com/talend/en-US/data-preparation-user-guide/8.0/extracting-numbers-contained-in-column)
* [Calculating the mean of two or more columns](https://help.qlik.com/talend/en-US/data-preparation-user-guide/8.0/calculating-mean-of-two-or-more-columns)
* [Number Formats](https://help.qlik.com/talend/en-US/data-preparation-user-guide/8.0/number-formats)
* [Operators Reference](https://help.qlik.com/talend/en-US/data-preparation-user-guide/8.0/operators-reference)
* [Using metric prefixes](https://help.qlik.com/talend/en-US/data-preparation-user-guide/8.0/using-metric-prefixes)