| A．2400 | B．24 | C．240 | D．48 |
| 20×7= | 40000÷80= | 480+80= | 560×0= |
| 17×200= | 900÷6= | 140×60= | 7200÷90= |
| 13×70= | 240÷40= | 21×40= | 3600÷200= |
| 297×11≈ | 416÷70≈ | 645÷79≈ | 98×102≈ |
| 421×26= | 205×43= | 540×80= |
| 656÷82= | 8100÷300= | 765÷25=验算： |
| 24×5= | 48.3÷100= | 35×20= | 75﹣15×3= |
| 60÷4= | 36+154= | 560÷80= | 25×9×4= |
| 24+16×0= | 420×20= | 0.729×10= | 4×25÷25×4= |
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