One of these is the parental desire for quick results. Many parents look at constructivist math and, relying on instinct alone, conclude that it is nonsense. So they teach their kids methods of calculation that promise to be more efficient in the short term.
許多家長直覺認定建構方式太愚蠢，又教給孩子較有效率的運算方法，結果老師一套、家長一套，孩子自然更糊塗了。