五年级上册数学 简便计算专项练习

五年级上册数学 简便计算专项练习


简介:
(1)53×10.1 =53×(10+0.1) =53×10+53×0.1 =530+5.3 =535.3 (2)0.125×96 =0.125×(100-4) =0.125×100-0.125×4 =12.5-0.5 =12 (3)45×21-50×2.1 =450×2.1-50×2.1 =(450-50)×2.1 =400×2.1 =840 (4)4.2×6.51+3.49×4.2 =4.2×(6.51+3.49) =4.2×10 =42