12．
| 口算题． 100-65= | 150×2= | 2500÷5= | 10-8.6 | 4.7+0.3= |
| 30×50×0= | 270×30= | 210÷1= | 570÷3= | 5.7-0.9= |
11．用24时记时法，下午3时是（ ）
0 156770 156778 156784 156788 156794 156796 156800 156806 156808 156814 156820 156824 156826 156830 156836 156838 156844 156848 156850 156854 156856 156860 156862 156864 156865 156866 156868 156869 156870 156872 156874 156878 156880 156884 156886 156890 156896 156898 156904 156908 156910 156914 156920 156926 156928 156934 156938 156940 156946 156950 156956 156964 199269
| A． | 5时 | B． | 15时 | C． | 17小时 | D． | 5小时 |