MS Excel
You can select a single range of cells by

Dragging over the desired cells
Pressing the Ctrl key while dragging over the desired cells
Clicking the upper-left cell in a group of cells and then pressing the Shift key while clicking the lower right cell in a group of cells
Pressing the Shift key and an arrow key

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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

Click on Remove Formatting tool on Standard Toolbar
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

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