五年级数学上册小数简便计算暑假衔接题

五年级数学上册小数简便计算暑假衔接题


简介:
加法交换律 0.75+9.8+0.25 =(0.75+0.25)+9.8 =1+9.8 =10.8 加法结合律 48.5+0.4+0.6 =48.5+(0.4+0.6) =48.5+1 =49.5 乘法交换律 2.5×5.6×0.4 =(2.5×0.4)×5.6 =1×5.6 =5.6 乘法结合律 99×12.5×0.8 =(12.5×0.8)×99 =10×99 =990 加法交换律与结合律 6.5+0.28+3.5+0.72 =(6.5+3.5)+(0.28+0.72) =10+1 =11 乘法交换律与结合律 2.5×1.25×0.4×0.8 =(2.5×0.4)×(1.25×0.8) =1×1 =1 乘法分配律(提取式) 1.35×12-1.35×2 =1.35×(12-2) =1.35×10 =13.5 乘法分配律(添项) 3.5×8+3.5×3-3.5 =3.5×8+3.5×3-3.5×1 =3.5×(8+3-1) =3.5×10 =35