MS Excel
A numeric value can be treated as a label value if it precedes with

Exclamation (!)
Apostrophe (')
Ampersand (&)
Hash (#)

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MS Excel
Rounding errors can occur

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

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