If you have a spreadsheet with time values that have been added to the spreadsheet as text values, you need the TIMEVALUE function. This will allow you to convert the text values into valid time values. A common scenario where this might be useful is when you've been provided data to import into Excel, and the times in the imported data are not recognised by Excel as valid times.

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Entering the same formula or value into multiple cells can be time consuming and boring. Most people, if they want to enter the same formula into a row or column of data, will enter the formula in the first cell, then copy and paste it into the rest of the cells where they need the formula. This lesson shows you an even faster way to do it.

When printing in Excel, it is sometimes useful to print a set of rows (e.g. column headings) on each page in the print out. There is nothing worse than having a printout that runs to multiple pages, with the column headings only printed on the first page. This lesson shows you how to get header rows printing at the top of every page in Microsoft Excel 2011 for Mac. You will also learn how to print header columns on the left of every page in your printout.

Rounding in Excel refers to reducing the number of digits in a number to make it easier to work with. A common example is rounding a price to two decimal places. Rounding errors can cause havoc with your spreadsheets without you even realising it. A common mistake occurs when you change the display format of a number to show fewer digits after the decimal point and assume that the number has been rounded for use in other calculations. This lesson explains how rounding in Excel works, and shows you how to use the different rounding functions available in Excel.

This lesson explains how to use Autosum. Autosum is a powerful feature that can save you time if you need to add up cells or columns of data. It is often faster than creating a formula by hand, especially when you have a large amount of data to add up. In this lesson you'll learn how to use Autosum, and some of its limitations.

If you're using Word to present a table of data that includes numbers, you can use Word's built in formulas to add up those numbers rather than manually calculate them each time they change. This can also eliminate the possibility of error - particularly important if you're producing a sales proposal or an important report.

INDEX is an Excel function that allows you to find a value inside a list or table of data in Excel. If you know (or can calculate) the row and column position of the value you want, INDEX is the function to retrieve that value for you. This lesson shows you how to use the INDEX function and includes some simple examples to help illustrate how you can use it.

This lesson shows you now to extract text from a cell in Excel. This is useful when you have a cell containing combining numbers and text, such as a part number, or several text values separated by commas. It introduces the RIGHT() and LEFT() functions, which are essential text manipulation functions in Excel.

The SUMPRODUCT function allows you to multiply two arrays of numbers together (e.g. Quantity Sold and Price Per Unit) and add the results each individual calculation together. Without the SUMPRODUCT function, you'll find yourself having to create a third column in which you multiply the Quantity by Price for each row, and then find the sum of all the individual formulas. This lesson shows you how to use SUMPRODUCT to do all that with just one formula.

When you create a new Pivot Table, Excel either uses the source data you selected or automatically selects the data for you. But data changes often, which means you also need to be able to update your pivot tables to reflect the new or changed data. This lesson shows you how to **update existing data**, and **add new data** to an Excel pivot table.

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