Question

72.09×1.83的積有________位小數(shù)．3.6的一半是________．

Answer 1

四    1.8
分析：根據(jù)小數(shù)乘法的計(jì)算法則，先按照整數(shù)乘法的計(jì)算法則算出積，再看兩個(gè)因數(shù)一共有幾位小數(shù)，就從積的末尾數(shù)出幾位點(diǎn)上小數(shù)點(diǎn)．由此解答．3.6的一半就是求3.6÷2是多少．
解答：根據(jù)積的小數(shù)位數(shù)等于兩個(gè)因數(shù)小數(shù)位數(shù)的和，72.09×1.83，兩個(gè)因數(shù)一共有四位小數(shù)，那么積是四位小數(shù)；
3.6÷2=1.8；
故答案為：
點(diǎn)評(píng)：此題主要考查小數(shù)除法的意義，及在小數(shù)乘法中積的小數(shù)位數(shù)與兩個(gè)因數(shù)的小數(shù)位數(shù)之間的關(guān)系，積的小數(shù)位數(shù)等于兩個(gè)因數(shù)小數(shù)位數(shù)的和．