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Try and solve the ancient numeral part of the course challenge

In this video, Dr. Yossi Elran challenges you to try and solve the ancient numeral part of the course challenge
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Let’s get back to the aliens. Hmmm! The second row. Roman numerals. Well, I’m not sure we know exactly everything. Let’s just recall what we’ve done so far. We’ve done the first line - which was 4 times 142857 is equal to, sorry, is equal to 571428 which is correct. Now we have a house with 7 in it, let’s put it over here, a house with the number 7 in it is equal to CXLII with a bar on the top - what does that bar mean? - DCCCLVII Your turn!

It’s time again for the course challenge. Try and decipher the Roman numeral:
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CXLIIDCCCLVII

You can ask for hints in the discussion, but don’t give away the answer. That you’ll be able to see on the next step. Good Luck!

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Maths Puzzles: Cryptarithms, Symbologies and Secret Codes

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