You have two options:

1. format the cells as Text before entering the values
2. enter an apostrophe as the first character typed
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Gary''s Student - gsnu200750


"Sorehead" wrote:

When I try to put a string of 18 digits in a column (similar to this
350001660334434123) the last three digits change to 000 (making the number
350001660334434000), I have change the column to format in 'General' but this
throws up an error message and nothing else seems to give me what I need.
Any help would be appreciated.