https://bugs.documentfoundation.org/show_bug.cgi?id=146604

            Bug ID: 146604
           Summary: Calc - calculation error at last two digits with big
                    numbers (15 digits)
           Product: LibreOffice
           Version: 7.1.1.2 release
          Hardware: Other
                OS: Windows (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Calc
          Assignee: [email protected]
          Reporter: [email protected]

Description:
when I make a sum of two big numbers with 15 digits each, the last two digits
are not calculated correctly.
No matter if the last two digits are decimal places or not.

Steps to Reproduce:
#1
1. enter the number 5,629,499,534,213.13 in cell A1
2. double the number in A2 with =2*A1
or

#2
1. enter the number 4,503,599,627,370,496 in cell A1
2. enter the same number 4,503,599,627,370,496 in cell A2
3. in A3 sum the two above with =SUM(A1:A2)

Actual Results:
#1
11,258,999,068,426.30

#2
9,007,199,254,740,990

Expected Results:
#1
11,258,999,068,426.26

#2
9,007,199,254,740,992


Reproducible: Always


User Profile Reset: No



Additional Info:
if you go on doubling the numbers, the results are always wrong.

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