2019年简便算法综合练习课(谢屏)精品教育.ppt
智游简算城,小数、整数简便运算练习课 学苑街小学:谢 屏,简便算法的综合练习课,执 教 者:谢 屏,简 算 城,智游,口算关,8×125,=1000,口算关,8×12.5,=100,口算关,0.8×1.25,=1,口算关,25×4,=100,口算关,2.5×4,=10,口算关,0.25×0.4,=0.1,口算关,24×5,=120,口算关,2.4×5,=12,口算关,2.4×0.5,=1.2,口算关,8×1251000 8×12.5 100 0.8×1.251 25×4 100 2.5×4 10 0.25×0.4=0.1 24×5= 120 2.4×5= 12 2.4×0.5=1.2,观察这3组,你能快速计算出来吗?,简算厅,25×18×4 0.257.30.75 142×1958×19 3.6×(100.1) 782353347 56÷0.7÷0.8,说说简算的依据是什么?,简算对对碰,2.5×32 1.5×(125×8) 66×201 2.5×4×8 1.5×125×8 2÷(0.25×0.4) 2÷0.25÷0.4 0.75×(9.9+0.1) 0.75×9.90.75×0.1 66×2001,简算小法庭,36×0.25 1.31.3×9 =9×(4×0.25) =(1.31.3)×9 =9×1 =2.6×9 =9 =23.4 2.6×172.6×22.6 =2.6×(172) =2.6×19 =49.4,( ),(× ),(× ),简算赛车场,3.25-0.48-0.52 12.5×25×0.8 0.15×99+0.15 60.8×25-20.8×25 36×10.1 42÷0.7÷0.6,简算魔术师,(你能写出几种算法) 0.9 0.9 0.9 0.90.7,