Ah! Ces Français!

Did you know that when French people say 1.421, they actually mean one thousand four hundred and twenty-one? And when they say 1,421, they mean one decimal four two one. They say "un virgule quatre deux un"

Obviously now, the British use 1,421 to mean one thousand four hundred and twenty-one and when they write 1.421, it's one decimal four two one.

We can imagine the complications that could arise from British & French writing to each other about money. E.g. "Cher Monsieur Stuffton, je suis heureux de vous transmettre par virement bancaire le montant de 3.421623 euros. Veuillez me confirmer réception. Monsieur Dupont"

And the British guy simply not understanding what the fuss is all about. There is apparently a convention now, and that should help the French, but not the British.