Hi. Original poster here. I have amended the line in the post to make clear that the "useless" claim was not intended to apply to all of Khan's videos; only to the decimal ones.
As for motives, I would invite you to read deeper on the blog to get a sense of what motivates my work. See especially the "Talking Math with Your Kids" series, where you will find the following sentiment expressed in multiple ways:
"But I don’t want Griffin and Tabitha‘s mathematical educations to depend on better telling. I want them to explore and to wonder. I want them to commit to their ideas and see what the consequences of those ideas are, and to revise their thinking when their present ideas are not good enough to explain what’s going on in the world.
And what I want for my own children is no different from what I want for my students, and no different from what I want for all children.
There is a place for good, mathematically correct explanations. I want kids to experience those when they’re the right move.
More importantly, I want them to learn to think for themselves."
> As for motives, I would invite you to read deeper on the blog to get a sense of what motivates my work. See especially the "Talking Math with Your Kids" series, where you will find the following sentiment expressed in multiple ways:
Do you have any videos of your own we can watch, so as to get a better handle on the way you think these things should be made?
As for motives, I would invite you to read deeper on the blog to get a sense of what motivates my work. See especially the "Talking Math with Your Kids" series, where you will find the following sentiment expressed in multiple ways:
"But I don’t want Griffin and Tabitha‘s mathematical educations to depend on better telling. I want them to explore and to wonder. I want them to commit to their ideas and see what the consequences of those ideas are, and to revise their thinking when their present ideas are not good enough to explain what’s going on in the world.
And what I want for my own children is no different from what I want for my students, and no different from what I want for all children.
There is a place for good, mathematically correct explanations. I want kids to experience those when they’re the right move.
More importantly, I want them to learn to think for themselves."