格子乘法介绍
- 时间:2020-04-12 12:48:25
- 分类:数学世界
- 阅读:166 次
“格子乘法”是15世纪中叶,意大利数学家帕乔利在《算术、几何及比例性质摘要》一书中介绍的一种两个数的相乘的计算方法。格子算法介于画线和算式之间。这种方法传入中国之后,在明朝数学家程大位的《算法统宗》一书中被称为’铺地锦”。
在四年级上册人教版数学书上有,先把因数分别写在上和右边,然后算6*7=42,写在右上角的格子上,4写左边,2写右边,以此类推,填好格子;最后,把同一斜线上的数相加:0落下;2+3+0=5,5写在下左方;4+8+2=14,向前进一位,4写在左下方;2+1=3,3写在左上方,因此得到:46*75=3450。
你能仿照例子算出“357×46”的积吗?
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