I have a question regarding number formatting?

Xander1

Board Regular
Joined
Nov 28, 2006
Messages
52
When I enter a 16 digit credit card number, excel flips that last numer to a different number, usually a 0. Why, and how can I fix this?
 

Excel Facts

Why does 9 mean SUM in SUBTOTAL?
It is because Sum is the 9th alphabetically in Average, Count, CountA, Max, Min, Product, StDev.S, StDev.P, Sum, VAR.S, VAR.P.

barry houdini

MrExcel MVP
Joined
Mar 23, 2005
Messages
20,825
If you have a cell format as number it only recognises up to 15 significant figures. Format cell as text
 
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