The number 5 represents the need for adjustment, some kind of change, or that added something that brings the situation out of balance again.  It represents the struggle and challenge of inner and outer growth; adapting to feedback about your action; working out the kinks.  Coins are associated with the material world, acquisitions of wealth and possessions, our connection to Earth and Nature, sensation, matters pertaining to the physical plane, the body, health and physical or sexual activities.  Coins can also be connected with practicality, groundedness and being realistic.