Either there is a difference in the characters that make up those entries. Or
one of the values is text even though it's comprised of all digits.
You can test by picking out the two cells that you know are the same.
Then use:
=a10='sheet2'!aa23
If that's false, then try this in two more empty cells:
=isnumber(a10)
and
=isnumber('sheet2'!aa23
If one of those is true and the other is false, then you can either change the
formula or fix the data.
No both formulas give out false value i have same numbers in two different
work sheet what i want is it should check if sheet 1 column a10 matches the
same number in sheet 2 at column aa23 basically it should match the number
like
Sheet 1
column A
3000111009806550
3000111009106790
3000111109862360
3000110909152070
The same number are avaiable in sheet2 but dont know what row number