Question

3.56×2.44的積有________位小數(shù)；8.4÷0.07的商的最高位在________位上．

Answer 1

四    百
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．
根據(jù)小數(shù)除法的計算法則，先移動除數(shù)的小數(shù)點，使它變成整數(shù)，除數(shù)的小數(shù)點向右移動幾位，被除數(shù)的小數(shù)點也向右移動幾位，然后按照除數(shù)是整數(shù)的小數(shù)除法計算．據(jù)此解答．
解答：3.56×2.44=8.6864，積是四位小數(shù)．
8.4÷0.07=120，商的最高位在百位上．
故答案為：四，百．
點評：此題考查的目的是理解掌握小數(shù)乘、除法的計算法則．