“格子乘法”是15世纪中叶意大利数学家使用的一种计算方法,后来传入我国,明朝数学家程大位在《算法统宗》一书中把它称为“铺地锦”。下面,我们以“357×46”为例,给同学们介绍“格子乘法”的使用方法。首先,画出方格和斜线,然后,在格子外面写下相应的数字,再用乘法口诀进行计算。 Lattice Multiplication is a calculation method used by Italian mathematicians in the mid-15th century and was later introduced into our country. Ming dynasty mathematician Cheng Da-bit called it in the book The Algorithm Ungazong “. Next, we use ”357 × 46 “ as an example, to introduce students ”grid multiplication " method of use. First, draw squares and slash lines, then write down the numbers on the outside of the grid and use multiplication formulas.