12．直接写得数．
0 156804 156812 156818 156822 156828 156830 156834 156840 156842 156848 156854 156858 156860 156864 156870 156872 156878 156882 156884 156888 156890 156894 156896 156898 156899 156900 156902 156903 156904 156906 156908 156912 156914 156918 156920 156924 156930 156932 156938 156942 156944 156948 156954 156960 156962 156968 156972 156974 156980 156984 156990 156998 199269
| 200×9= | 50×12= | 25+29= | 56+36= |
| 70×20= | 84÷7= | 52÷4= | 68÷4= |
| 42÷3= | 23×10= | 720÷8= | 63+17= |
| 36×20= | 38÷2= | 95÷5= | 4+39= |
