Question

4.13×3.67的積有________位小數(shù)，4.05×2.1的積有________位小數(shù)．

Answer 1

四    三
分析：根據(jù)小數(shù)乘法的計算法則：先按照整數(shù)乘法的計算法則算出積，再看兩個因數(shù)一共有幾位小數(shù)，就從積的右邊起數(shù)出幾位點上小數(shù)點．據(jù)此解答．
解答：根據(jù)小數(shù)乘法的計算法則可知：積的小數(shù)位數(shù)等于兩個因數(shù)小數(shù)位數(shù)的和．
所以，4.13×3.67的積有四位小數(shù)；
4.05×2.1的積有三位小數(shù)．
故答案為：四，三．
點評：此題考查的目的是掌握小數(shù)乘法的計算法則，明確：積的小數(shù)位數(shù)等于兩個因數(shù)小數(shù)位數(shù)的和．