五年级数学小数的简便计算题40道

五年级数学小数的简便计算题40道

  • 简介

    (1)8.2×99+8.2 =8.2×(99+1) =8.2×100 =820 (2)8.8×12.5 =(8+0.8)×12.5 =100+10 =110 (3)12.5×3.4×0.8 =12.5×0.8×3.4 =10×3.4 =34 (4)16×12.5×4.3 =2×8×12.5×4.3 =(2×4.3)×(8×12.5) =8.6×100 =860 (5)0.78×9.9 =0.78×(10-0.1) =0.78×10-0.78×0.1 =7.8-0.078 =7.722

五年级数学小数的简便计算题40道