Question

0.328×1.256的積有________位小數(shù)，37.6÷0.25的商的最高位在________位．

Answer 1

六    百
分析：0.328×1.256，根據(jù)小數(shù)的乘法的計(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)，就從積的右邊起數(shù)出幾位點(diǎn)上小數(shù)點(diǎn)．
37.6÷0.25，根據(jù)小數(shù)除法的計(jì)算法則：先移動(dòng)除數(shù)的小數(shù)點(diǎn)，使它變成整數(shù)，除數(shù)的小數(shù)點(diǎn)向右移動(dòng)幾位，被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)相同的位數(shù)，然后按照除數(shù)是整數(shù)的除法法則進(jìn)行計(jì)算．
解答：0.328×1.256=0.411968，積有六位小數(shù)．
37.6÷0.25=150.4，商的最高位是百位．
故答案為：六，百．
點(diǎn)評(píng)：此題考查的目的是牢固掌握小數(shù)乘法、除法的計(jì)算法則，明確：積的小數(shù)位數(shù)等于兩個(gè)因數(shù)小數(shù)位數(shù)之和．