0.76×1.023的積有________位小數(shù);6.5×3.07的積有________位數(shù).
5 3
分析:根據(jù)因數(shù)有幾位小數(shù),就從積的末尾數(shù)出幾位點上小數(shù)點得到乘積,由此即可進行解答.
解答:根據(jù)因數(shù)有幾位小數(shù),就從積的末尾數(shù)出幾位點上小數(shù)點得到乘積可得:
0.76×1.023中,第一個因數(shù)有2位小數(shù),第二個有3位小數(shù),所以0.76×1.023的積有5位小數(shù);
6.5×3.07中,第一個因數(shù)有1位小數(shù),第二個有2位小數(shù),所以6.5×3.07的積有3位小數(shù);
故答案為:5,3.
點評:此題考查了小數(shù)乘法中確定積的小數(shù)位數(shù)的方法.