Amir H.Asghari
2010 (1389). 56 رشد آموزش ریاضی. شماره 100. ص
Publication year: 2010

چه خالی است a جای (“a” is greatly missed) is the third of a series of papers about the different roles of letters in algebra, the first one was What a delicious a! (a چه خوشمزه است) and the second one, What a silent a! (a چه ساکت است). This one-page paper gives some example of how different and mostly ambivalent uses of the so-called “blank square” or the like in arithmetic  could be a source of  confusion when children start to use letters in algebra.

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