A dvanda compound denoting an approximate number of concrete substances, is optionally singular.,
As, उपदशं दन्तोष्ठ or उपदशा दन्तोष्ठाः 'nearly ten i.e, nine or eleven sets of teeth and lips;' उपदशं मार्दङ्गिकपाणविकम् or उपदशा मार्दङ्गिकपाणविकाः 'nearly ten (nine or eleven) mridanga and panava players.'
An indeclinable, when compounded with a numeral, may either be a Bahuvrihi or an Avyayibhava compound. When the compound is singular in form, it is Avyayibhava, and when it takes proper number-terminations, it is Bahuvrihi compound. As, उपदशं; उपदशाः 2.2.25.,