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This product is great for introducing students to the importance of putting units on EVERYTHING!
I gave this activity to my students as a "pop quiz" and gave them about 15 minutes to answer the questions. I then had them switch papers with a partner for "grading". I told the students that the answer was either right or wrong, no partial credit! I then began reading the answers...notice how questions 2 and 4 are the same? Well, they have different answers and I was a real stickler on the students' answers needing to match mine.
After the quizzes were graded (no one has ever gotten over a 50%), we had a class discussion on what made the quiz so challenging. The consensus: numbers are pointless if we don't know what they mean!