Math in language arts?
Video one: The chef is incorrect because he is doing every crazy thing he can except correct multiplication. He even does addition wrong. If he had even added up the seven 13s correctly he would have had the right answer of 91.
Video two: The man is doing the same thing in this video as the chef in video one. He isn't multipling or dividding correctly. If he was doning the problem correct the answer would be 70.