Modify Table column data type

Dear All,
We have one user contains more than 100 tables(Production). I need to change some of table columns data types without affect data's.
Please suggest me to do that.
Thanks in advance,
Moorthy.GS

Dear Sybrand,
Thanks for your reply.
I tried below ways to modify the datatypes.
1) Tried to modify datatype FLOAT to NUMBER while data is persists.
2) Tried to take a export of that user and import the dump without data's and modify the datatype. After that, i tried to import the dump with rows=y option. But it failed due to constraint problems.
Please advise...
Cheers,
Moorthy.GS

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Modify Table column data type

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