Change Number Suffix using Choose()

You may use these two options depending on your preferences.

First Option: If you want to put a suffix on a certain range.

=BYROW(TOCOL(F3:F,1),LAMBDA(x,IF(VALUE(RIGHT(FLOOR(x/10),1))=1,x&"th",IFERROR(CHOOSE(RIGHT(x),x&"st",x&"nd",x&"rd"),x&"th"))))

First Output:

Second Option: Based on the cell.

=F3 & CHOOSE(IF(AND(((F3)>3),((F3)<20)),
                    5,
                    MIN(RIGHT((F3),1)+1,5)),
              "th","st","nd","rd","th") & " "

Second Output:

References:

• CHOOSE()
• IF()