Earlier today Apple issued an update for the entire iWork suite for iPad (which includes Pages, Numbers and Keynote) to address bugs found in version 1.3, released in November.
The minor 1.3.1 update for all the three apps of the suite fixes an issue with the predictive text menu when using Chinese or Japanese characters; Numbers for iPad went under a deeper bug-fixing procedure with a resolved crash due to Region Format in the Settings and the inability to save cells when the app was quit and restarted.
You can find the updates here. [Thanks, Willy]