题目内容
| 算一算，比一比． 21×40= | 30×32= | 41×20= |
| 21×400= | 300×32= | 410×20= |
| 210×40= | 30×320= | 41×200= |
| 21×40=840 | 30×32=960 | 41×20=820 |
| 21×400=8400 | 300×32=9600 | 410×20=8200 |
| 210×40=8400 | 30×320=9600 | 41×200=8200 |
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题目内容
| 算一算，比一比． 21×40= | 30×32= | 41×20= |
| 21×400= | 300×32= | 410×20= |
| 210×40= | 30×320= | 41×200= |
| 21×40=840 | 30×32=960 | 41×20=820 |
| 21×400=8400 | 300×32=9600 | 410×20=8200 |
| 210×40=8400 | 30×320=9600 | 41×200=8200 |