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

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
Use =if() function to format the required numbers red

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MS Excel
You can use the format painter multiple times before you turn it off by

Pressing the Ctrl key and clicking the format painter button
Double clicking the format painter button
You can use the format painter button on ly one time when you click it
Pressing the Alt key and clicking the format painter button

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