MS Excel scientific notation (example: 2.231321654E+01)

Question

I am editing a legacy Visual Basic 6.0 program. It reads from a GPIB instrument and obtains a raw string in scientific notation. For example:

2.231321654E+01

Another line in the program processes that string so that it would be suitable for input into the spreadsheet:

Round(2.231321654E+01, 1) returns 22.3

I want to have 2 decimal places:

Round(2.231321654E+01, 2) should return 22.31, but NO, it returns 22.3. Why?

Another approach:
I tried to bypass the Round() processing and have the program input the raw string directly into the spreadsheet. I still get 22.3

Yet another approach:
I bypassed the program entirely and manually input 2.231321654E+01 into any cell in the spreadsheet. I still get 22.3

Summary:
I want to write 2 decimal places into the spreadsheet. How do I do it? I think the original author manipulated the cell number properties to retain only up to one decimal place. How do I manipulate it? What should I look for in the code?