引用:
原帖由 Shiawase 於 8-7-2007 22:19 發表 
唔好意思, the name "九因歌" sounds very familiar, what is it? (...it must be my old age, I can't remember what it is!?!)
乘數, 一一如一, 一二如二...
http://www.newasiabooks.com/subject/maths/learn_maths/learn_maths_3a_0512_a.htm
其實我原本也是忘記了什麼是"九因歌" 
, 真係好耐無聽過呢3個字.
但只要等到有子女入小學一二年級, 就會再遇上九因歌3個字囉.
