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四年级数学下册小数简便计算方法
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2024-02-27
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四年级数学下册小数简便计算方法


简介：
2.5×4.4 =2.5×(4+0.4) =2.5×4+2.5×0.4 =10+1 =11 7.6×10.1 =7.6×(10+0.1) =7.6×10+7.6×0.1 =76+0.76 =76.76 4.75×9.9 =4.75×(10－0.1) =4.75×10－4.75×0.1 =47.5－0.475 =47.025 2.5×4.4 =2.5×(4+0.4) =2.5×4+2.5×0.4 =10+1 =11 7.6×10.1 =7.6×(10+0.1) =7.6×10+7.6×0.1 =76+0.76 =76.76 4.75×9.9 =4.75×(10－0.1) =4.75×10－4.75×0.1 =47.5－0.475 =47.025 3.6×9.9+0.36 =3.6×9.9+3.6×0.1 =3.6×(9.9+0.1) =3.6×10 =36 0.47×0.46-4.7×0.045 =0.47×0.46-0.47×10×0.045 =0.47×(0.46－0.45) =0.47×0.01 =0.0047