16．口算
0 159150 159158 159164 159168 159174 159176 159180 159186 159188 159194 159200 159204 159206 159210 159216 159218 159224 159228 159230 159234 159236 159240 159242 159244 159245 159246 159248 159249 159250 159252 159254 159258 159260 159264 159266 159270 159276 159278 159284 159288 159290 159294 159300 159306 159308 159314 159318 159320 159326 159330 159336 159344 199269
| 3900÷30= | 1200×700= | 52万+28万= | 0÷72= |
| 420×20= | 270÷90= | 1800÷300= | 69万-45万= |
| 9100÷700= | 400×900= | 250×280= | 120×340= |