Put a number and a boolean of choice into the [Roman {} (user permission to calculate decimals: {})] block and the scroll will do everything else for you! Changelog: Update I: The Basic Numerals Added: I, V, X, L, C, D and M. Added: An indicator in the Scratch Addons debugger when attempting to convert negative or non-whole numbers. (If you don't have Scratch Addons, then I recommend installing it and keeping it open so that you can stay tuned on anything that the scroll may not be able to solve.)
