I know how you feel emanuela.

In French the number 70 is said as “sixty and ten” (soixante et dix)
The number 80 is said as “four twenties” (quatre-vingts)
the number 90 is said as “four twenty ten” (quatre-vingt-dix)

Even though I am fluent in both English and French I invariable have to correct myself when writing down a number that someone is telling me. The worst is the70 range. Because of the rhythm of pronunciation there is a slight pause between sixty … and ten.