MS Excel
You can auto fit the width of column by

Double clicking on column right border on column header
Double clicking on the column name on column header
Double click on the cell pointer in worksheet
Double clicking on the column left border of column header

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

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

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