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

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MS Excel
Text formulas:

Return ASCII values of characters
Concatenate and manipulate text
Show formula error value
Replace cell references

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