MS Excel
If you need to remove only the formatting done in a range (numbers and formula typed there should not be removed), you must

Double click the Format Painter and then press Esc key in keyboard
From Edit menu choose Delete
From Edit menu choose Clear and then Formats
Click on Remove Formatting tool on Standard Toolbar

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MS Excel
To create a formula, you first:

Choose the new command from the file menu
Type the equals sign (=) to tell Excel that you’re about to enter a formula
Enter the formula using any input values and the appropriate mathematical operators that make up your formula
Select the cell you want to place the formula into

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