Roman Numerals

NEW! After the vid, take my Roman numerals quiz on my website! Here's your link: www.letsdomath.ca/roman-numer...
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Roman numerals are still in use and it's cool to be able to decode them.
I give their values, then count to 20, drawing attention to the 'less than', 'more than' conventions. 30, 40, 50, 60, 70, 80, 90, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 2000, 3000.
Practice decoding: 3 examples, progressively more tricky with more numerals involved.
Easy access: re-write, spacing the letter groups apart, then decode.
I used some photos with Creative Commons attributions in this film.
Tim Pierce: photographer of Boston-Hibernian Hall cornerstone
This file is licensed under the Creative Commons Attribution 3.0 Unported license.
Clock (Valladolid)
By dronepicr (historic watch in valladolid Mexico) [CC BY 2.0 (creativecommons.org/licenses/b...)], via Wikimedia Commons
Watch
By Seiko (Yeoman) [CC BY 3.0 nl (creativecommons.org/licenses/b...)], via Wikimedia CommonsHTML