skygirl65,
What do you want to do with these numbers?
I ask because earthandfire's solution will keep these stored as number, which is great for some purposes. But you must understand that while the numbers display with 10 digits, they are all still stored as numbers.
If you want to force there to really be leading zeros, then you must convert these numbers to text. This could be accomplished by using a formula. Say your first value is in A1. Then you can use [COLOR=blue white]=text(A1,"0000000000")[/color] to convert all numbers to text strings with leading zeros.
To see the difference between these two methods, you can use the LEN function or Copy 'n' Paste Special > Values.
[tt]_____
[blue]-John[/blue]
[/tt][red]Quidquid latine dictum sit, altum viditur[/red]
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