1、口算 2.5+0.9 = 3.6+4.9 = 5.6 -4.8 = 3.06+ 4.4 = 8.8 +4.5= 5.2 + 4.8 = 32.9 -10.9 = 2、计算下面各题并且验算
3.64+1.48 22.32 +12.59 7.85 +1.15
8.24-7.58 10.21-5.59
三、用简便方法计算。
(1)27.3+73.2+72.7
(3) 5.85-1.75-0.25
(5) 21.85+1.89+2.15
(7)42.5-22.17-7.83
32-14.57 (2) 5.85-(1.85+2.19) (4)7.68-2.74-1.26 (6)24.8+14.6+15.4 (8)3.8+1.37+6.2+12.63
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