MS Excel
You can select a single range of cells by

Dragging over the desired cells
Pressing the Shift key and an arrow key
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 Ctrl key while dragging over the desired cells

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MS Excel
To create a formula, you first:

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

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