The numbers in order from one to five in French are un, deux, trois, quatre and cinq. Twenty is "vingt," 30 is "trente," 40 is "quarante," and 50 is "cinquante." Learning the numbers one to 20 is a good start to counting in French.
LanguageGuide.org offers a list of numbers and explains how to pronounce them properly. There is a listening challenge as well as a speaking challenge available to help potential speakers learn and practice their French numbers.
Counting in French usually follows a basic pattern similar to English. Speakers can deduce larger numbers by adding together simpler numbers. For example, 25 is a result of adding together the numbers 20 and five. In French, 20 is "vingt," while five is "cinq," so 25 would be "vingt-cinq" in French.
Though most French numbers follow a basic pattern of adding words together, there are certain numbers that are unique in French that do not follow this pattern. The numbers 11 to 16 are unique because they have their own words to represent them. Numbers that end in a one such as 21, 31 and 41 have the word 'et' instead of a dash in the middle; for example, the number 21 in French is "vingt et un."