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There's a stack exchange comment saying it's harder to forge $20 to $320 than it is to forge 20$ to 320$.

This is why you fill the empty part of the field with a long horizontal line.



I always just write the change in a xx/100 format, which would make it obvious if someone else filled in more numbers.

Was this really a problem at some point? My friends have told me about it, but my parents never bothered to mention it to me growing up.




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