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
All of above
Apply Conditional Formatting command on Format menu
Select the cells that contain number between 0 and 100 then click Red color on Text Color tool

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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
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

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