口算.
| 3×5= | 80-3= | 30+49= | 6×3= | 99-4= |
| 23+8= | 4×3= | 7+55= | 3×1= | 6×2= |
| 9×6= | 34-6= | 5×5= | 4×2= | 4×5= |
| 46-6= | 6+5= | 60-7= | 6×5= | 67-9= |
| 5×6-6= | 24+7-8= | 6×6-9= | 19+5×2= |
| 3×5= | 80-3= | 30+49= | 6×3= | 99-4= |
| 23+8= | 4×3= | 7+55= | 3×1= | 6×2= |
| 9×6= | 34-6= | 5×5= | 4×2= | 4×5= |
| 46-6= | 6+5= | 60-7= | 6×5= | 67-9= |
| 5×6-6= | 24+7-8= | 6×6-9= | 19+5×2= |