Khan Academy wants schools to use their Common Core lessons.
According to the Khan Academy blurb, "To cover the (Common Core State) Standards, we've brought on a team of fantastic math teachers, tutors, and professors, who write math questions and peer review one another's content."
Yet I hated the first math lesson I saw.
It is said to be intuitive yet defies the laws of playground physics.
As a child, my friends and I used to love playing on a seesaw, or teeter- totter. We could nearly always balance the seesaw, even though we had different weights. All you had to do was get the heavier child to sit closer to the middle of the seesaw.
Put simply, the random sample of Common Core content on Khan Academy I saw was atrocious pedagogy.
Children know more about the workings of seesaws (teeter-totters) than the mathematics teachers and professors consulting into Khan Academy.