Question

6.3×16.789的積里有________位小數(shù)．

Answer 1

4
分析：由于在乘法算式6.3×16.789中，6.3有一位小數(shù)，16.789有3位小數(shù)，根據(jù)小數(shù)乘法的運算法則可知，6.3×16.789的積里有1+3=4位小數(shù)．
解答：根據(jù)小數(shù)乘法的運算法則可知，
6.3×16.789的積里有1+3=4位小數(shù)．
故答案為：4．
點評：小數(shù)乘法的法則：小數(shù)乘以整數(shù)，先按整數(shù)乘法法則算出積，再看被乘數(shù)有幾位小數(shù)，就從積的右邊起數(shù)出幾位，點上小數(shù)點．