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How did the French end up with their 'crazy' numbers?

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How did the French end up with their 'crazy' numbers?
In French these petrol prices literally translate as 'the unleaded four-twenties-fifteen costs one euro and four-twenties-seventeen cents, while the unleaded four-twenties-eighteen costs one euro and four-twenties-ten cents'. (Photo by Sameer Al-DOUMY / AFP)
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Once you get above 69 things get a little complicated in France - we look at how France ended up with its bizarre numbering system, and why it will never change.

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Chris Ley-Wilson
In the 20 formula, what happened to 40 (deus vingt, of course) and 60 (trois vingt)? And how about 30 and 50 while we're about it? I've a situation with saying part of my car reg number, namely "quartre vingt et un", or should I say "quartre cents vingt et un"? No problem really but what's the rule?
Christopher Hobday Saint-Rémy-de-Provence, FR
Three score years and ten ring any biblical bells? I am fairly used to the number system and thought I was was OK until I was asked for my date of birth (1945). I blurted "Dix neuve cent, quarante cinq". I think it should have been "Mille, neuve cent, quarante cinq" but le docteur understood me perfectly well. As I left I apologised for my poor French. In response he offered a reassuring smiling handshake, and "Pas grave monsieur."
Philip Pinnell
so if it is a 20 based system why is it quarente and not deux-vingt?
Anonymous
Excellent article! Quattre vingt dix neuf points!
Anonymous
At one time, during the many years I lived in Belgium, my telephone number was
010 22 76 97. (Sorry if somebody else has that number now.) If I'd been living in France, I would have refused it! But then I think of how easily we Brits don't hesitate between 18 and 80, 19 and 90, so no writing down 99 as 80+19. Enough to deny you French nationality! My French accountant was bemused when I made him slow down on long numbers until I pointed out that what was 99 to him was 4x20+10+9. He'd never thought of it like that.

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