Question

列豎式計(jì)算下面各題．
36×0.52=

18.72

；
4.08×3.2=

13.056

；
19.3×4.4=

84.92

；
12.5×1.8=

22.5

．

Answer 1

分析：根據(jù)小數(shù)乘法的計(jì)算法則，先按整數(shù)乘法計(jì)算法則算出積，再看兩個(gè)因數(shù)中一共有幾位小數(shù)，就從積的末尾起數(shù)幾位點(diǎn)上小數(shù)點(diǎn)，末尾有“0”應(yīng)劃掉．據(jù)此判斷．

解答：解：①36×0.52=18.72；


②4.08×3.2=13.056；


③19.3×4.4=84.92；


④12.5×1.8=22.5．

點(diǎn)評：此題考查的目的是牢固掌握小數(shù)乘法的計(jì)算法則，關(guān)鍵是明確：積的小數(shù)位數(shù)等于兩個(gè)因數(shù)的小數(shù)位數(shù)之和．