While decimal numeral systems are widespread globally, empirical linguistic research confirms that certain languages utilize non-decimal bases (such as base-20) or possess restricted quantification inventories without a standard decimal base.
The claim asserts that certain modern spoken languages do not use the decimal number system. Retrieved papers such as [7] explicitly discuss base-20 systems, while [4] and [9] discuss languages with restricted systems or alternative compositional anchors lacking standard decimal bases. Thus, the evidence fully supports the claim.