=______：40=______%=______成．| 48÷4= | 81÷3= | 64÷2= | 80×3= | 0÷9= |
| 90÷6= | 103×5= | 606÷6= | 306÷3= | 840÷7= |
| 280÷7= | 32×5= | 840÷6= | 918÷9= | 960÷8= |
| 440÷4= | 95÷5= | 25×4= | 140÷7= | 824÷8= |
口算
| 260+400= | 640-400= | 900×9= | 400÷5= | 34×2= |
| 4800÷8= | 250-70= | 140×3= | 64-0= | 940+60= |
| 4×500= | 120×4= |  = |  = |  = |
| 605+200= | 24÷5= | 1- = | 60×9= | 400×7= |
| 210×3= | 45÷9= | 39÷7= | 125×8= | 133×2= |
| 89×5≈ | 181×2≈ | 12×7≈ | 512×4≈ | 311×3≈ |
| 960-160= | 280+80= | 32×3= |  = |  = |
| 15+5×2= | 15×4-25= | 10+10×0= | 20-12÷3= | 72÷8-8= |
，当________一定时，________和________成反比例．