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1、资料收集于网络如有侵权请联系网站删除谢谢精品文档小学数学五年级上册简便计算练习(答案卷)一、归类练习:3.29 0.73 2.27 3.290.732.27 7.5 2.5 7.5 2.5 =3.29(0.73 2.27 ) =3.29(0.73 2.27 ) =(7.5 7.5 )( 2.5 2.5 )=3.293 =3.293 =05 =6.29 =0.29 =5 (加法结合律)(减法的性质)(同级运算交换)7.3253.293.325 7.325(5.325 1.7) 7.325 (5.325 1.7) =7.3253.3253.29 =7.3255.3251.7 =7.3255.325
2、1.7 =43.29 =21.7 =21.7 =0.71 =0.3 =3.7 (减法交换)(减法的性质)(前面减号,脱括号变符号)3.29 0.73 2.29 2.27 3.290.25 4 0.1258.8 =(3.29 2.29 )( 0.73 2.27) =3.29 (0.25 4)=0.12581.1 =13 =3.291 =1 1.1 =4 =3.29 =1.1 (同级运算交换)(乘法结合律)(先拆数,乘法结合律)0.25 0.28 0.1253.2 2.5 35 10.2 =0.2540.07 = (0.1258)( 0.4 2.5)=35(100.2 )=10.07 =1 1 =
3、3510350.2 =0.07 =1 =3507 (先拆数,乘法结合律)(拆数,乘法结合律) =357 (拆数,乘法分配律)0.25 40.25 4 3.5 9.9 3.5 993.5 =(0.25 0.25 )( 44) =3.5 (100.1 ) =3.5 (991)=116 =3.5103.5 0.1 =3.5100 =16 =350.35 =350 (同级运算交换) =34.65 (乘法分配律)(拆数,乘法分配律)3.5 1013.5 3.59.9 3.5 0.1 3.5 2.7 350.73 =3.5(1011) =3.5(9.9 0.1 ) =3.52.7 3.5 7.3 =3.5
4、100 =3.510 =3.5(2.7 7.3 )=350 =35 =3.510 (乘法分配律)(乘法分配律) =35 精品资料 - - - 欢迎下载 - - - - - - - - - - - 欢迎下载 名师归纳 - - - - - - - - - -第 1 页,共 4 页 - - - - - - - - - - 资料收集于网络如有侵权请联系网站删除谢谢精品文档(先利用积不变的规律转化,然后再用乘法分配律)3.5 2.7 3.5 0.7 (32 5.6) 0.8 3.5 0.6 0.5 0.6 =3.5(2.7 0.7 ) =320.8 5.6 0.8 =(3.5 0.5) 0.6 =3.5
5、2 =407 =30.6 =7 =47 =5 (乘法分配律)(后两题类似分配律,但只适用于(ab)c 和(ab)c,而 a(bc) 和 a(b c) 不能用。)4.9 1.4 70.254 70.125 =4.9(70.2 ) =7(0.25 4)=78 =4.970.2 =71 =56 =0.70.2 =7 (乘除法转化规律,转化时=3.5 符号相反,转化前后的2 数(拆数,除法的性质)(除法的性质)相乘得 1。)7.35 (7.35 0.25) 7.35 (7.35 0.25) =7.357.35 0.25 =7.357.35 0.25 =10.25 =10.25 =4 =0.25 (除法
6、的性质)(前面是除号,脱括号符号相反)二、混合练习:3.070.381.62 1.29 3.7 2.71 6.3 82.45 1.55 =3.07(0.38 1.62 )=(1.29 2.71 )( 3.7 6.3 ) =8 (2.45 1.55 )=3.072 =410 =84 =1.07 =14 =4 (减法的性质)(加法交换律和加法结合律)(减法的性质)3.25 1.79 0.59 1.75 23.40.8 13.4 7.2 0.32 403 =(3.25 1.75 )( 1.79 0.59) =(23.413.4)0.8 7.2 =0.32(400+3)=51.2 =10(0.8 7.
7、2 ) =0.324000.323 =6.2 =108 =1280.96 (同级运算交换) =2 =128.96 (减法交换和减法的性质)(拆数,乘法分配律)3.2 0.36 4.8 1.64 1.23 3.4 0.23 6.6 0.25 36 =(3.2 4.8 )( 0.361.64)=(1.230.23)( 3.4 6.6 ) =0.25 49 =82 =110 =19 =10 =11 =9 (加法交换律和加法结合律)(同级运算交换)(拆数,乘法结合律)精品资料 - - - 欢迎下载 - - - - - - - - - - - 欢迎下载 名师归纳 - - - - - - - - - -第
8、 2 页,共 4 页 - - - - - - - - - - 资料收集于网络如有侵权请联系网站删除谢谢精品文档12.7 (3.7 0.84)36.541.764.54 0.250.73 4 =12.73.7 0.84 =36.544.54 1.76 =0.2540.73 =90.84 =321.76 =10.73 =8.14 =30.24 =0.73 (减法的性质)(减法交换)(乘法交换律和乘法结合律)7.6 0.8 0.2 7.6 0.85 199 0.258.5 4 =7.6(0.8 0.2 ) =0.85 (2001) =0.25 48.5 =7.61 =0.85 2000.85 1 =
9、1 8.5 =7.6 =170-0.85 =8.5 (乘法分配律) =169.15 (乘法交换律和乘法分配律)(拆数,乘法分配律)1.28 8.6 0.72 8.6 12.5 0.960.8 10.4 9.6 0.35 =(1.28 0.72 )8.6 =12.50.8 0.96 =10.4 3.36 =28.6 =100.96 =7.04 =17.2 =9.6 (无简算)(乘法分配律)(乘法交换律和乘法结合律)0.8 (4.3 1.25 ) 3.12 3.1299 28.6 10128.6 =0.81.25 4.3 =3.12 (199)=28.6(1011)=11.25 =3.12100
10、=28.6 100 =1.25 =312 =2860 (乘法交换律和乘法结合律)(乘法分配律)(乘法分配律)(4.23 6.17 )0.8 0.86 15.7 0.86 14.7 2.4 102 =10.40.8 =0.86(15.714.7)= 2.4 (1002)=8.32 =0.861 =2.41002.4 2 (无简算) =0.86 =2404.8 (乘法分配律) =244.8 (拆数,乘法分配律)147.322.68 2.64 8.67 7.36 11.33 2.31 1.2 0.5 =14(7.32 2.68 )=(2.64 7.36) (8.67 11.33) =2.31(1.2
11、 0.5) =1410 =10 20 =2.310.6 =4 =30 =1.386 ( 减法的性质 ) (加法交换律和加法结合律)(乘法结合律)(2.5 0.25)0.4 9.16 1.5 0.5 9.16 3.6 3.6 0.5 =2.50.4 0.250.4 =9.16 (1.5 0.5 )=3.6(10.5 )=10.1 =9.161 =3.6 0.5 (可转化成 3.6 2)精品资料 - - - 欢迎下载 - - - - - - - - - - - 欢迎下载 名师归纳 - - - - - - - - - -第 3 页,共 4 页 - - - - - - - - - - 资料收集于网络如
12、有侵权请联系网站删除谢谢精品文档=0.9 =9.16 =1.8 (乘法分配律)(乘法分配律)(乘法分配律)4.5 1.8 930 0.6 5 63.42.5 0.4 4.252.5 9.9 0.17 =4.5(90.2 )=930(0.6 5) =63.4 (2.5 0.4 )=1.79.9 1.7 0.1 =4.590.2 =930 3 =63.41 =1.7(9.9 0.1 )=0.50.2 =310 =63.4 =1.710 =2.5 (除法的性质)(除法的性质) =17 (拆数,除法的性质)(前半部分死算,后半部分利用积不变的规律转化,最后用乘法分配律。)3.9 (1.3 5)(7.7
13、 1.54 )0.7 2.5 2.4 2.7 45 =3.91.3 5 =7.70.7 1.540.7 =2.540.6 =2.7(95)=35 =112.2 =100.6 =2.7 95 =0.6 =13.2 =6 =0.35 (除法的性质)(相当于分配律)(拆数,乘法结合律) =0.06 (拆数,除法的性质)0.35 1.25 20.8 32.4 0.9 0.1 32.4 150.25 15(0.15 0.4 )=(0.35 2)( 1.25 0.8 )=32.4(0.9 0.1 )=15( 50.05 ) =15 0.15 0.4 =0.71 =32.4 1 =15 50.05 =1000.4 =0.7 =32.4 =30.05 =250 (乘法交换律和乘法结合律)(乘法分配律)(拆数,除法的性质) =60 (除法的性质)精品资料 - - - 欢迎下载 - - - - - - - - - - - 欢迎下载 名师归纳 - - - - - - - - - -第 4 页,共 4 页 - - - - - - - - - -