"18.5 is not typically discussed in mathematical literature..." Replace "not typically discussed" with "rarely mentioned|rarely explored|infrequently considered". "Mathematical literature" to "mathematical texts|academic writings|scientific publications".
The number 18.5, as a decimal number, can be written as a fraction: eighteen and a half=237⁄10. This proportional representation illustrates the relationship between 18.5 and its component parts. 18 18.5
"Some numerologists might interpret 18.5 as a variation..." "Interpret" could be "analyze|examine|study". "Variation" as "modification|adaptation|modification". as a decimal number