STR$ returns a string representation of a number.
VAL converts a string representation of a number to a number.
 
STR$(numeric-expression)
VAL(stringexpression$)
 
    - numeric-expression    Any numeric expression.
    - stringexpression$     A string representation of a number.
 
Example:
    PRINT "Decimal 65 is represented in hexadecimal as ";
    PRINT "&H" + LTRIM$(STR$(41))
    PRINT VAL(RIGHT$("Microsoft 1990", 4))