I find it very difficult to pronounce the words fifths (as in four fifths or parallel fifths). The consonant cluster [fθs] is very difficult for me to utter.
I know that in some cases the pronunciation of the plural is different from that of the singular for the sake of simplification of pronunciation. For example (correct me if I am wrong), the word clothes can be pronounced [kloʊz] instead of [kloʊðz], and mouths can be pronounced [maʊz] instead of [maʊðz].
Is there any possible simplification for the pronunciation of fifths or is pronouncing [fifθs] piece of cake for native speakers?