MS Excel
You can select a single range of cells by

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
Dragging over the desired cells

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MS Excel
When all the numbers between 0 and 100 in a range should be displayed in Red Color, apply

Use =if() function to format the required numbers red
Select the cells that contain number between 0 and 100 then click Red color on Text Color tool
All of above
Apply Conditional Formatting command on Format menu

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