1、1【简便计算】班级: 姓名: 一、口算下面各题。( 23分)102.65 0.90.08 528349 614.4 240.0412.342.3 03.8 0.770.33 71.4 67.50.257.284 51.41.6 4001258 1.940.5 800.125= 3 = 6 6= 2 ( + )= 10 2=7318357513.273.27= ( )12= 187.711187.7= 1 62.5%=4 8二、写出下列每题在简便运算时所运用的定律或性质 (12分 )4 +3.25 +6.8 25(80.4)1.25 7 (2 )312 5423( ) ( ) ( )( + )7
2、2 93.53 162.5128721( ) ( ) ( )三、用简便方法计算。( 65分)1125997 998+1246+9989 (870087087)871258.8 1.34.253.73.75 17.15(3.52.85)3.4993.4 4.81.01 0.4(2.573) (1.61.61.61.6)25 ( ) 94651873671025212.32.455.74.55 2 0.1250.256497519264.2870.6421300 78367.87417 17 8542137 0.125 0.5 2.42 +4.58 43 872143125100 4.253 (2 1 ) 3.83.93.90.10.13.9 265654312.1( + )105 152在算式中填上一个数,使它能用乘法分配律进行简便计算并算出来。15+0.12225