Les nombres de 69 à 99

After having well memorized the sequence of numbers up to 69, I propose this video to understand the functioning of the numbers from 69 to 99. It is a question of memorizing the names of the numbers and also to understand why 70 is called seventy and 90, ninety. To do this, I suggest using additions such as 60+14=74 in order to memorize the names more easily and also to make the distinction between 64 and 74. I use the same technique for the 90 family.