A modular flooring assembly including a flooring component adhered to a tray substrate is described. The modular flooring assembly may be interconnected with additional modular flooring assemblies to form a modular floor suitable for most flooring applications. The flooring component may be tile or wood or other materials commonly used in flooring applications. Convention fill-in grout or a snap-in grout may be used with the modular flooring assemblies. One suitable snap-in grout is a right angle grout member.