题目内容
| 估算: 398÷4≈ | 813÷9≈ | 197÷5≈ |
| 22×49≈ | 59×61≈ | 91×22≈ |
| 估算: 398÷4≈100; | 813÷9≈90; | 197÷5≈40; |
| 22×49≈1000; | 59×61≈3600; | 91×22≈1800; |
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题目内容
| 估算: 398÷4≈ | 813÷9≈ | 197÷5≈ |
| 22×49≈ | 59×61≈ | 91×22≈ |
| 估算: 398÷4≈100; | 813÷9≈90; | 197÷5≈40; |
| 22×49≈1000; | 59×61≈3600; | 91×22≈1800; |