Custom number format: comma preceding last two digits

Question

How do I format numbers in cells as follows:

• 12 as 12

• 123 as 1,23

• 1234 as 12,34

• 12345 as 123,45

I tried ##,##, but this formats 42343 as 42,343 instead of the desired 423,43

####,## also not working.

Answer 1

This custom format code works for the examples in your question:

[>=100]#\,#0;#