Of course the meaning is heavily dependant on the context; if someone asks "rr dmd ft?" (how much?) answering in just "l" should be clear that 9 is meant, not "the" or the colour indigo. However, to be sure, you can add "sts" (number) in front of the number, to explicitly indicate that currently it has the numerical meaning.
Also, excuse my sarus-grammar, I've only learned a few words and haven't yet spent any time on the grammatical rules, but hopefully my meaning is clear