计算,能简算的要简算.
24×(0.5+0.05) | 1.83×2.6+7.4×1.83 | 4.8×0.25×4 |
9.07-22.78÷3.4 | 5.2×10.1 | 3.76×0.25+9.06. |
口算与估算.
60×30= | 50×60= | 33×30= | 270+140= | 600×40= |
20×12= | 1100-10= | 630÷70= | 469÷8≈ | 44×56≈ |
24×(0.5+0.05) | 1.83×2.6+7.4×1.83 | 4.8×0.25×4 |
9.07-22.78÷3.4 | 5.2×10.1 | 3.76×0.25+9.06. |
60×30= | 50×60= | 33×30= | 270+140= | 600×40= |
20×12= | 1100-10= | 630÷70= | 469÷8≈ | 44×56≈ |