I think that this would be a fun way for the students to be able to tell me how they felt about a lecture or an assignment!
Take a class period and give out a worksheet or two for students to complete as you talk to each student our one minute and discuss how they feel about the topics you are learning about.
This could be used very well with things like math or spelling. give the class a question to answer and tell them to write it on their white-boards and then show it to you. It would be great so you know exactly who is struggling but nobody else does.
Label each corner A, B, C, or D and put questions up onto the board for the students to answer. If they think that the answer is B, they will go to the corner that is labeled B.
This is a fun website for teachers to use that encourages students to get answers correct. The teacher will insert the questions that they choose into Kahoot and put the code to join on the board. The students go onto the website, type in the code, and then play!