16．口算
0 158207 158215 158221 158225 158231 158233 158237 158243 158245 158251 158257 158261 158263 158267 158273 158275 158281 158285 158287 158291 158293 158297 158299 158301 158302 158303 158305 158306 158307 158309 158311 158315 158317 158321 158323 158327 158333 158335 158341 158345 158347 158351 158357 158363 158365 158371 158375 158377 158383 158387 158393 158401 199269
| 60×68= | 12×40= | 35+65= |
| 180-60= | 2700÷9= | 30×80= |
| 50×40= | 13×30= | 200×40= |