MS Excel
The auto calculate feature

A and C
Automatically creates formulas and adds them to a worksheet
Provides a quick way to view the result of an arithmetic operation on a range of cells
Can only add values in a range of 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

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

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