一、直接写得数

3.8×2=               10×0.7=             13.9×0=             508÷100=

5.5×1=               1.8×0.5=            3.2×3=               13.1×0.3=

0.08×1.25=           2.5×4=              2.5×8=               0.5×0.2=

0.6×0.1=             0.7×0.8=            2.5×8×0=            125×0.8=

二、竖式计算

2.8×0.7=           13×0.15=             0.39×0.6=         0.38×600=

7.05×2.4=           0.46×7.9=            89.3×7.6=         60.5×400=

三、混合运算

12.5×8.2×8             0.23×1.4＋0.23×8.6            0.125×（80＋0.8）

0.4×0.16×2.5               5.6×101                    7.85×99

1.15×99＋1.15            16.2×101－16.2              4.5×7.8＋5.5×7.8