五年级数学上册《小数简便计算》专项练习题,计算巩固!

五年级数学上册《小数简便计算》专项练习题,计算巩固!


简介:
399.6×9-1998×0.8 = 399.6×9-1998×2×0.4 = 399.6×9-399.6×4 = 399.6×5 =1998 12.9÷0.72+43.5÷3.6 =(12.9×5)÷(0.72×5)+43.5÷3.6 =64.5÷3.6+43.5÷3.6 =(64.5+43.5)÷3.6 =30 49.5×13.5-0.5×49.5+50.5×13 =49.5×(13.5-0.5)+50.5×13 =49.5×13+50.5×13 =(49.5+50.5)×13 =1300 36×2.54+1.8×49.2 =1.8×20×2.54+1.8×49.2 =1.8×(20×2.54)+1.8×49.2 =1.8×(50.8+49.2) =1.8×100 =180