French telephone numbers

This video is from the very clever people at Numberphile. I’m a big fan of Numberphile and only wish that I had teachers that made mathmatics this interesting when I was still in school.
Today Numberphile speakes to a French professor Dr Paul Smith from the University of Nottingham on the subject of French numbers.

When the French give someone their telephone number they tend to group the numbers into twos.

For example the number 555-1234-56789

This would be read as 55 51 23 45 67 89

cinquante-cinq
cinquante et un
vingt-trois
quarante-cinq
soixante-sept
quatre-vingt-neuf