深圳博物馆为配合基建工程在南头红花园清理了9座汉墓,其中3号墓出土一方刻有乘法算术的“九乘”口诀砖。砖呈长方形,长37、宽17、高4厘米。色青灰,质地坚硬,局部表面烘烧成玻璃状釉层,两面均模印菱形网格纹。其一面右侧约三分之一处的砖面,抹去纹饰,改刻九乘口诀。口诀分两行竖刻。左行文:“九九八十一八九七十二七九六十三六九五十四五九四十五”;右行 Shenzhen Museum to coordinate infrastructure projects in the South Red Garden cleared nine Han Tombs, one of the tomb unearthed on one side with a multiplication of arithmetic arithmetic “nine multiplication ” formula brick. The brick is rectangular, 37 long, 17 wide and 4 centimeters high. Blue, gray, hard texture, partial surface baked into a glazed glaze layer, both sides of the diamond-mesh pattern. About one-third of the brick on the right side of the side, erasing decoration, change nine carved formulas. Divination formula in two lines vertical engraved. Left line of text: “nine nine eight eight thousand eight hundred seventy seven seven six nine six six five fifty-five five hundred forty-five ”; right