Already mentioned but install and launch gparted. Insert the card then use the menu to refresh storage devices. After that, right click on it and create a new partition.
This depends on how you want to use it though. Do you need it to work with Windows/Mac/Linux? Do you need it to work in a phone or digital camera?
Let us know.
Err.. I should read more. You are using it with a tablet? Put it in the tablet and use it to format the card. It will probably be exFat. Easily readable and writable by a Linux system.
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