Applying a machine metaphor for functions, this virtual manipulative allows the learner to examine the relationship between input (domain) and output (range). The learner inputs numbers from one to four and the virtual machine generates output information in a table. The learner is challenged to find the output for values five through seven and enter them in the table. Errors are noted automatically. Using a new function button, different types of functions are randomly offered for investigation. Types include a function with alphabet letter output and a function with positive and negative ones for output. Instructions for using the manipulative, information about functions, and a link to the NCTM standard for number and operations are included. Copyright 2005 Eisenhower National Clearinghouse