The more television children watch, the less competent they are in mathematical knowledge  More than a third of children in the United States watch television for more than five hours a day; in South Korea the figure is only 7 percent  But whereas less than 15 percent of children in the United States understand advanced measurement and geometric concepts, 40 percent of South Korean children are competent in these areas
Ttherefore, if United States children are to do well in mathematics, they must watch less television
The instruction in advanced measurement and geometric concepts available to children in the United States is not substantially worse than that available to South Korean children.