Sara Van Der Werf is a teacher in Minnesota, who has been teaching middle school and high school students for the past 24 years. She writes about teaching on her highly-recommended blog. For the past three years, Sara has collected photographs of math mistakes taken from everyday life, both from the world around her and from the internet. The mistakes come from stores, signs, newspapers, TV, advertisements, etc.). Continue reading Examine Math Mistakes from Our Everyday Lives →