@howie_hua How do you feel about cross-multiplying and dividing to solve a proportion? A lot of district-level people in my area have told me that it is not okay to teach it because there is no mathematical reasoning behind it. But I feel like this explanation proves it.
@WiscOnline I am trying the Bingo game with my students. When they answer a question, it says the answer is correct, but when the time finishes counting down, it says question unanswered and they don't earn any points. Any ideas?