MS Excel
Rounding errors can occur

When you use addition and subtraction in a formula
Because excel uses hidden decimal places in computation
When you use multiplication, division, or exponentiation in a formula
When you show the results of formulas with different decimal places that the calculated results

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MS Excel
You can auto fit the width of column by

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

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