It is really important that you get to grips with your numbers! I need you to go over this video as MANY TIMES as you need in order to get these numbers in your head.
Un deux trois
one two three
quartre cinq six
four five six
sept huit neuf
seven eight nine
dix onze douze
ten eleven twelve
treize quatorze quinze
thirteen fourteen fifteen
seize dix-sept dix-huit dix-neuf vingt
sixteen seventeen eighteen nineteen twenty