Abstract: An apparatus and method for performing calculations is provided so that a paradigm of a tape is utilized in a calculator application that executes on a computing platform and which is configured to enable a user to see and interact with multiple virtual tapes that each show numerical values and operators. Each tape functions as a user-accessible memory and a memory value may be recalled from any one tape and that value placed on any other tape. The calculator application is configured to enable the user to enter a sequence of values and operators which are all displayable on a given tape, as well as support the user's ability to edit any value or operator that was previously entered on that tape. Calculations are updated to reflect the user's edits on both the tape currently being edited and any other tape that uses the edited tape as a memory.