Question

【題目】6.125×2.7的積有_____位小數(shù)；9.6÷0.32的商最高位是_____．

Answer 1

【答案】四 十位

【解析】

①根據(jù)小數(shù)乘法的計(jì)算法則，積的小數(shù)位數(shù)等于兩個(gè)因數(shù)小數(shù)位數(shù)之和，據(jù)此解答．

②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)使題變成整數(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)，再根據(jù)除數(shù)是整數(shù)的小數(shù)除法法則計(jì)算，據(jù)此解答

①因?yàn)?/span>6.125是三位小數(shù)，2.7是一位小數(shù)，所以6.125×2.7的積是四位小數(shù)；

②9.6÷0.32，轉(zhuǎn)化為：960÷32，所以商的最高位是十位．

故答案為：四；十位．