CASIO

To delete a single character or function:

Move the cursor so it is directly to the right of the character or function you want to delete, and then press .
In the overwrite mode, move the cursor so it is directly under the character or function you want to delete, and then press .

To insert a character or function into a calculation:

Use and to move the cursor to the location where you want to insert the character or function and then input it. Be sure always to use the insert mode if Linear Display is selected.

To clear all of the calculation you are inputting:

Press .