四升五年级数学 小数重点计算练习

四升五年级数学 小数重点计算练习


简介:
35×40.2 =35×(40+0.2) =35×40+35×0.2 =1400+7 =1407(乘法分配律) 3.5×99+3.5 =3.5×99+3.5×1 =3.5×(99+1) =3.5×100 =350(乘法分配律) 3.5×9.9+3.5×0.1 =3.5×(9.9+0.1) =3.5×10 =35(乘法分配律) 3.5×2.7-3.5×0.7 =3.5×(2.7-0.7) =3.5×2 =7(乘法分配律) 3.5×9.9 =3.5×(10-0.1) =3.5×10-3.5×0.1 =35-0.35 =34.65(乘法分配律) 3.5×2.7+35×0.73 =3.5×2.7+3.5×7.3 =3.5×(2.7+7.3) =3.5×10 =35(乘法分配律) 4.9÷3.5 =4.9÷(0.7×5) =4.9÷0.7:5 =7÷5 =1.4(除法性质) 7.35÷(7.35÷0.25) =7.35÷7.35×0.25 =1×0.25 =0.25(除法性质)