有人问:數學通訊第四卷第三期第20面載有祖冲之的圆周率之一是3.14159265。李儼著中國算學史(商務初版本)第29面所载亦同,不知何所依據。當答以:疇人傅所载「冲之更開密法,以圆徑一億为一丈,圓周盈數三丈一尺四寸一分五釐九毫二秒七忽,朒數三丈一尺四寸一分五釐九毫二秒六忽,正數在盈朒 Someone asked: One of the pi values ​​in the 20th surface of the third issue of the Mathematical Newsletter is 3.14159265. The same holds true for Li Xun’s 29th Facet of the History of Chinese Computer Science (first edition of business). When answering the question: "Chongzhi’s more open secret method, with a circle of one hundred million yuan, a circle of thirty feet, one foot and four inches, one minute, five centimeters, nine milliseconds, seven seconds, and a few turns. One foot and four inches, five minutes, nine milliseconds and six seconds. The positive number is in surplus.