This is not only for the teacher, but for the student as well. Although I am not an art teacher, I do my best to enclude art in the classroom. It allows students to express themselves withour feeling the need to worry so much about getting the entire assignment right on the dot. On this URL, there are activities for teachers to use and for students to use.
This URL provides multiple math practices to be used by student in the classroom. The tacher can also use them as a way to show what is to be done on the board.