口算．120÷6= 30×10= 3000÷5= 300÷3= 12×30= 505÷5= 960÷3= 69÷3= 2
| 口算． 120÷6= | 30×10= | 3000÷5= | 300÷3= |
| 12×30= | 505÷5= | 960÷3= | 69÷3= |
| 2000÷4= | 550÷5= | 90×50= | 53×20= |
| 181÷2≈ | 359÷6≈ | 81×29≈ | 43×68≈ |
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