小学数学2011版本小学四年级RJ四年级下册数学《小数加减法》练习课件（练习十七）.ppt

1、小数加法和减法练习课,小数的加法和减法,小学数学四年级下册,1.口算,2.5+0.9=7.8+1.6=11.7+2=0.39+0.15=1.2-0.5=4.7-2.8=,8.6-5.3=,0.96-0.33=,3.4,9.4,0.54,0.7,1.9,3.3,0.63,13.7,2.计算下面各题并验算。,3.64+0.48=,21.56+6.74=,7.85+9.19=,41.2-15.6=,8.24-3.56=,11.65-7.39=,3.64,0.48,+,4.12,4.12,验算：,4.12,0.48,-,3.64,21.56,6.74,+,28.30,28.30,验算：,28.30,6

2、.74,-,21.56,7.85,9.19,+,17.04,验算：,17.04,17.04,9.19,-,7.85,41.2,15.6,-,25.6,25.6,验算：,25.6,15.6,+,41.2,8.24,3.56,-,4.68,4.68,验算：,4.68,3.56,+,8.24,11.65,7.39,-,4.26,4.26,验算：,4.26,7.39,+,11.65,0.35千克,0.95千克,答：杯里的水有0.35千克.,答：杯里的水有0.95千克.,162.8元,160.00元,163.54元,159.26元,322.80元,（）,（）,（）,（）,12.5,更正：,3.79,+,

3、16.29,23.4,更正：,13.4,-,10.0,更正：,5.00,4.26,-,0.74,更正：,7.16,3.00,-,4.16,5元6角2分+3元零9分=5.62元+3.09元=,5.62元,3.09元,+,8.71元,8.71元,1t30kg+980kg=1.30t+0.980t=,1.30t,0.980t,+,2.280t,2.280t,4m35cm+5m70cm=4.35m+5.70m=,4.35m,5.70m,+,10.05m,10.05m,10kg4kg800g=10.00kg+4.800kg=,10.000kg,4.800kg,-,5.200kg,5.200kg,4km8

4、00m-3km50m=4.800km-3.050km=,4.800km,3.050km,-,1.750km,1.750km,6km-2km860m=6.000km-2.860km=,6.000km,2.860km,-,3.140km,3.140km,75.80元,45.50元,+,121.30元,【第一种方案】,【第二种方案】,92.50元,58.00元,+,140.50元,75.80元+45.50元=,121.30元,92.50元+58.00元=,140.50元,【第三种方案】,75.80元+58.00元=,75.80元,58.00元,133.80元,133.80元,【第四种方案】,92.5

5、0元+45.50元=,92.50元,45.50元,+,+,138.00元,138.00元,2.09m-1.97m=,【跳高】,【跳远】,【铅球】,【铁饼】,【标枪】,【100米跑】,7.52m-7.01m=,22.63m21.76m=,76.80m71.68m=,72.28m63.92m=,10.79秒10.49秒=,2.09,1.97,-,0.12,0.12m,7.52,7.01,-,0.51,0.51m,22.63,21.76,-,0.87,0.87m,76.80,71.68,-,5.12,5.12m,72.28,63.92,-,7.36,7.36m,10.79,10.49,-,0.30,0.30秒,10.找规律填数。（1）0.2，0.4，0.6，0.8，。（2）1.11，1.16，1.21，1.26，。（3）4.363，4.366，4.369，4.372，。（4）7.897，7.892，7.887，7.882，。,第（1）题，观察数据，看出规律：每个数字之间相差0.2；,1.2,1.0,【观察分析】,第（2）题，观察数据，看出规律：每个数字之间相差0.05；,1.31,1.36,4.375,第（