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1、百分數(shù)與小數(shù)的互化百分數(shù)與小數(shù)的互化把下面小數(shù)化成分數(shù),并說一說你是怎樣轉(zhuǎn)化的。把下面小數(shù)化成分數(shù),并說一說你是怎樣轉(zhuǎn)化的。0.20.2 0.125 0.125 1.6 3.375 1.6 3.375 先化成分母是先化成分母是1010、100100、10001000的分數(shù),的分數(shù),然后再約分。然后再約分。小數(shù)小數(shù)分數(shù)分數(shù)1025110001258110615810003375827把下面分數(shù)化成小數(shù),并說一說你的方法。把下面分數(shù)化成小數(shù),并說一說你的方法。用分子除以分母,除不盡的保留兩位小數(shù)用分子除以分母,除不盡的保留兩位小數(shù)分數(shù)分數(shù)小數(shù)小數(shù)7 76 63 38 8= = = =3 38 80
2、.3750.3757 76 61.171.171001001401401把把 0.24 0.24、1.4 1.4 、0.123 0.123 化成百分數(shù)。化成百分數(shù)。0.24 = 24 %1.4 = 140 %0.123 = 12.3 %2410010010104 41 1100010001231231010141410010012.312.3=把把 27% 27% 、135% 135% 化成小數(shù)。化成小數(shù)。27% = 27100 = 0.27135% =27100135100= 135100 = 1.352小數(shù)化成百分數(shù)小數(shù)化成百分數(shù)百分數(shù)百分數(shù) 2.把小數(shù)點向右移動兩位把小數(shù)點向右移動兩位,再加上百分號再加上百分號注意:位數(shù)不夠時用注意:位數(shù)不夠時用“0”補足。補足。小數(shù)小數(shù)1.把小數(shù)化成分母是把小數(shù)化成分母是100的分數(shù),再改寫成百分數(shù)的分數(shù),再改寫成百分數(shù)百分數(shù)化成小數(shù)百分數(shù)化成小數(shù)百分數(shù)百分數(shù) 2.把百分號去掉,同時把小數(shù)點向左移動兩把百分號去掉,同時把小數(shù)點向左移動兩位。位。注意:位數(shù)不夠時用注意:位數(shù)不夠時用“0”補足。補足。小數(shù)小數(shù)1.先把百分數(shù)寫成分母是先把百分數(shù)寫成分母是100的分數(shù),再化成小數(shù)的分數(shù),再化成小數(shù)。小游戲小游戲: :連連看連連看36%0.360.45 45%2.5250%0.0111.1%