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
South Korean children are more disciplined about doing schoolwork than are children in the United States.