Critics hit the math of Khan

Khan Academy’s free math videos teach procedures rather than concepts, according to critics, reports the San Jose Mercury News. A ”Mystery Teacher Theatre 2000″ video by two Michigan professors, David Coffey and John Golden, pokes fun at a Khan lesson on how to multiply and divide negative number. (Sal Khan responded by posting a revised lesson.) Dan Meyer, a Stanford University doctoral candidate in education, who blogs at dy/dan and Justin Reich, who blogs at EdTech Researcher, are offering $750 in prizes for the best online critique of Khan Academy videos. The deadline is Wednesday.

Some teachers are using Khan videos to “flip” their teaching. Instead of listening to a teacher’s explanation in class and doing problems as homework, students watch video explanations at home and work through problems in class with the teacher there to help.

But, Coffey said, that model sticks with the old-fashioned I-talk-you-listen mode of teaching.

. . . Math teacher Hye Lee Han, in San Jose’s Evergreen School District, this summer had her class of struggling students preparing for eighth-grade algebra skip the videos and just tackle the Khan questions. She was using Khan Academy for the first time, to supplement her lessons.

“I love it,” she said about Khan. What she really likes is the color-coded, real-time spreadsheet showing each student’s progress, including the number of attempts at solving each problem. “I can keep track of them, who’s mastered it, who’s struggling,” she said.

Khan’s virtual rewards are popular with students.

An SRI study of Khan Academy’s effectiveness in the classroom will be released this fall.

About Joanne