四年级数学下册《复杂的简便计算》思维训练题汇总!

四年级数学下册《复杂的简便计算》思维训练题汇总!


简介:
(1)12×(40-5) =12×40-12×5 =480-60 =420 (2)64×9-14×9 =(64-14)×9 =50×9 =450 (3)35×98 =35×(100-2) =35×100-35×2 =3500-70 =3430 (4)102×45 =(100+2)×45 =100×45+2×45 =4500+90 =4590 (5)23×134-34×23 =23×(134-34) =23×100 =2300 (6)648+203 =648+2+201 =650+201 =851 (7)98×32 =(100-2)×32 =100×32-2×32 =3200-64 =3136 (8)41×99 =41×(100-1) =41×100-41×1 =4100-41 =4059