If you use Numbers for iOS, you can now hide and unhide rows and columns, preserve rich text in tables when importing and exporting spreadsheets, add reflections to shapes, and lock or unlock objects. You can also import or export Numbers for Mac spreadsheets with filters, and turn filters on and off. These new features make it easier to move back and forth between your Mac and iOS device when working on a spreadsheet in Microsoft Excel or Numbers for Mac. (A full list of features that work between Numbers for iOS and Microsoft Excel is available on Apple's Numbers compatibility page.)
Pages, Keynote, and Numbers for iOS are available in the App Store for $10 each and have been optimized for the iPhone 5; version 1.7 is a free update if you already own any of these apps. Each requires iOS 5.1 or later, and is compatible with the iPad, iPhone 3GS or newer, and third-generation iPod touch or newer.
iWork 9.3 is recommended for users of iWork 9.0 and later and requires OS X 10.7.4 or later. It's available through the Mac App Store, Software Update, or through a standalone installer on the Apple Support Downloads page.
Apple has a complete list of all features compatible between Microsoft Office and iWork for iOS on the company's website