Decimal

  By default, Calculator appears in decimal mode when you
  start Calculator.

  To change to Hexadecimal or Octal mode, choose the
  Hexadecimal or Octal menu item from the Mode menu.

  Additional topics:

  *   Mode Menu

  *   Edit Menu

  *   File Menu

  *   Decimal Keypad and Special Function Bindings

  *   Overview of Calculator