I am not sure how to write French numbers because teaching websites do not all follow the same rules, in terms of the hyphens, use of "et," etc. Here is an example of two sites that show up when I google French numbers from 1 to 100:
And some differences between what these two sites teach:
- Soixante et un vs. Soixante-et-un
- Quatre-vingt-et-un vs. Quatre-vingt-un
I appreciate a link to a reliable site so I can learn the numbers properly. Bonus if also includes examples of using thousand, million, billion, etc. Thanks.