五年级上册数学简便计算题库
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简介
(1)18.35+5.07-4.07+6.65 =(18.35+6.65)+(5.07-4.07) =25+1 =26 (2)1140÷(5.7×8) =1140÷5.7÷8 =200÷8 =25 (3)17.47+20.31-8.47+2.69 =(17.47-8.47)+(20.31+2.69) =9+23 =32 (4)3.2×101 =3.2×(100+1) =3.2×100+3.2×1 =320+3.2 =323.2 (5)8×6.57×0.125 =8×0.125×6.57 =1×6.57 =6.57 (6)8×9.75×0.125 =8×0.125×9.75 =1×9.75 =9.75 (7)43.4×101-43.4 =43.4×(101-1) =43.4×100 =4340 (8)4.35×2.4+56.5×0.24 =43.5×0.24+56.5×0.24 =(43.5+56.5)×0.24 =100×0.24 =24
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