In column A, cell format is "FR-"0.0, and the formula in A6 is

IF(A6="",MAX(A5,B5)+0.1,""),

I would like it to increment FR-1.1, FR-1.2, FR-1.3....FR-1.9, FR-1.10,
FR-1.11; however, it is currently incrementing FR-1.1, FR-1.2.....FR-1.9,
then FR-2.0

Is there anything I can do to the formula to count pass "10"?

Thanks.