use these cards with my class for assessment purposes. I print them front and back on Avery postcards and then laminated them. One side has a sad face and the other side has the word no, students hold up the cards to answer questions in class. The face side is especially helpful in math with my first graders to assess how my students feel about a certain standard or task. I have also used these prior to common core in 3rd and 5th grades. The kids really like them.