《小數(shù)乘小數(shù)》小數(shù)乘法和除法PPT課件2
根據(jù)12×13=156,直接寫出下面各題的積。
(1)1.2 × 13 =15.6
(2)12 × 0.13 =1.56
(3)1.2× 1.3 =1.56
因數(shù)的小數(shù)位數(shù)和積的小數(shù)位數(shù)有什么關(guān)系?
兩個因數(shù)里一共有幾位小數(shù),就從積的右邊數(shù)幾位點上小數(shù)點。
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怎樣計算小數(shù)乘小數(shù)?
小數(shù)乘法,先按照整數(shù)乘法的計算方法計算,再看因數(shù)中一共有幾位小數(shù),就從積的右邊起數(shù)出幾位,點上小數(shù)點。
1.在下面各題的積里點上小數(shù)點。
4.8×6.7= 3 2.1 6
0.48×6.7= 3.2 1 6
4.8×0.67= 3.2 1 6
0.48×0.67=0.3 2 1 6
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