| 1.2×0.3= | 8.9÷0.89= | 0.37+0.73= | 0.25×3.9= |
| 1.2÷0.3= | 1.25÷0.25÷4= | 1-0.11= | 3.7×1.25÷1.25×2= |
| 3.2×0.98≈ | 4.9×59≈ | 8.09÷1.9≈ | 10-0.03= |
| 1.2×0.3=0.36 | 8.9÷0.89=10 | 0.37+0.73=1.1 | 0.25×3.9=0.975 |
| 1.2÷0.3=4 | 1.25÷0.25÷4=1.25 | 1-0.11=0.89 | 3.7×1.25÷1.25×2=7.4 |
| 3.2×0.98≈3.2 | 4.9×59≈300 | 8.09÷1.9≈4 | 10-0.03=9.97 |
分析：本题根据小数乘法、除法、加法、减法的运算法则计算即可．及运用计算当中的估算方法进行估算．
点评：完成此类问题的关键是要细心，注意做题的质量，同时要注意提高做题的速度．