口算.
505÷5= | 0×10= | 90×50= | 0÷4= | 12×30= |
402+658≈ | 18×21≈ | 32×59≈ | 427÷7≈ | 440÷9≈ |
计算下列各题、能简便的要简便计算
(1)3.2×1.25+4.8×1 | (2)(15-14×)× |
(3)28.2×44.54+4.454×718 | (4)×+÷. |
估算下面各题.
4.03×1.98≈ | 3.95×0.2≈ | 8.1×10.01≈ | 16.2÷1.9≈ |
59.8÷3.1≈ | 10.32÷0.21≈ | 99.9÷0.5≈ | 70.2×3.02≈ |
505÷5= | 0×10= | 90×50= | 0÷4= | 12×30= |
402+658≈ | 18×21≈ | 32×59≈ | 427÷7≈ | 440÷9≈ |
(1)3.2×1.25+4.8×1 | (2)(15-14×)× |
(3)28.2×44.54+4.454×718 | (4)×+÷. |
4.03×1.98≈ | 3.95×0.2≈ | 8.1×10.01≈ | 16.2÷1.9≈ |
59.8÷3.1≈ | 10.32÷0.21≈ | 99.9÷0.5≈ | 70.2×3.02≈ |