.一口算0.58= 3.60.4= 39.680= 47.61= 0.157= 40.5= 120.06= 121.2= 330= 3.26+3.24= 二豎式計算8.082.68 5.54629.38 17.040.26 8.353.5 三脫式計算 2.65+2.77）（1.98-0.98）= 3.791.6+6.391.6= 0.45120.2= 6.22.12.1= 一 口算0.2+0.80.5= 6.031000= 100.6= 6.450.01= 2.540.36= 0.10.1= 0.240.5= 5.43.6= 1.250.25= 10.24.5 二豎式計算（得數保留一位小數）0.430.29 52.60.23 4.580.37 2.91.8三脫式計算2.81.430.57= 106.068.5= 60.251.8= 1443.627.2=一 口算0.240.5= 5.43.6= 1.250.25= 10.24.5 2.56 90.25 0.1254= 1.2580.5= 160.01= 1.780.3=二豎式計算4.38.14 27.60.45 27.60.45 2012 三脫式計算0.873.16+4.64= 6.80.750.5= 13.750.1252.75= 53+23.47.2= 一口算0.010.1= 1.820= x-0.4x= 5d-2d= 0.270.003=3.60.4= 0.60.8 2.43 0.120.7 45 二豎式計算2.50.7= 2.50.7= 3.259.04= 5.080.25三脫式計算2.8810.430.243.5= 28-(3.4+1.252.4)= （31.8+3.24）5= 31.54(6+3)=一口算1.60.5 0.20.05 2.52.34= 1.51.51.5= 3.61.22.4= 4.7644.7= 0.540.54= 38.500.38= 0.60.8= 30.9=二豎式計算36.816 10.13.3 15.311 0.781三脫式計算0.64257.8+2.2= 22.5+2.52= 19464.81.80.9= 36.724.259.9=一口算2.50.4= 3.60.4= 12.58= 500.04= 800.3=1.19= 9.32-5.98= 7.61-7.09= 9.73-5.77= 8.71+3.59= 二豎式計算164235= 834622= 2247= 048350=三脫式計算51807056= 242.42.50.8= 3.416（0.01635）= 9.45.810.65.8=一口算8.03-7.77= 1.64+1.32= 9.29-7.66= 2.26+9.34= 6.45-4.57= 5.19+7.38= 5.74+8.14= 7.81+ 6.1= 7.72+7.07= 9.31- 4.22=二，豎式2.143.6= 0.150.84= 2.074.8= 2.0511=三想一想，下面各題怎樣算簡便就怎樣算！3.04+5.83+16.96+4.17 1.253225 3.251.6-0.63.25 0.8840.25一請你在一分鐘內快速口算出下面各題的得數。3.8+5.2= 6.54= 10-0.99= 3.81.9= 13.90.1= 5.117= 0.2580.4= 1.2580= 4.80.24= 0.6321= 二認真計算下面各題，除不盡的得數保留兩位小數。（23.6-5.20.4）6.7 26.7（2.53+1.84）5 1.255.78 100.22.5三計算下面各題，能用簡便方法計算的要用簡便方法計算。0.258.34+1.7 23.6-0.50.5-6.75 2.3（5.38-1.82）+6.442.3 （2.4+2.4+2.4+2.4）0.25 一口算63070= 4.3-0.8= 3.4+1.6= 1.80.3= 2.540=4700= 1850= 4.26= 7.22.8 0.90.01 二豎式計算12634= 10764= 95234= 8136=三脫式計算13.84.5+6.2 8.032+12.60.4 21.31.8-16.39 1530.513一口算120.6= 0.10.001= 3.20.08= 2.80.2= 7.9+3.1=0.90.5= 0.245= （0.85-0.85）0.95= 2.54= 200.5=二豎式計算1388629= 92516= 850= 09911=三下面各題，怎樣簡便就怎樣算。3.216.8+83.23.2 16.8-3.28-6.72 （19.5-5.3）2.8+15 7.5（5.1+2.1）1.8一口算0.90.01 3.57.6 0.420.5 0.511.7 4.72 + 4.2=5.20.13 991.01 13.52.87.2 32.819 70.25二、列豎式計算126743= 2922（保留2位小數） 2844814= 32607=三脫式計算。40.22.716.2（24.832）77.32-4.370.84.050.050.81一口算30.20.5 0.960.3 1.50.4 2.50.70.8= 82.58（2.50.25） 0.360.64 64.3216 72.80.8 8.40.21.60.2 二列豎式計算。（前兩行并驗算）2.70.32= 3556=0.366.9=15.3612=三脫式計算7.620.16-0.168.75（12.57）5.4（2.74）1.032+360.36一口算 8.44.2 0.050.8 2.560.37 1.250.80.5 122.51.233 3.21.6 3.53.53 19.62 8.82.2= 二豎式2.341.5=11.72.6=25.242=3.7434=三脫式計算0.432（6.21-6.09）4.80.4-2.1210.048900.46（保留兩位小數）2.462.5-7.9一口算3.92.03 7.20.32.80.3 13.89.9 2.42.5 161.6 0.754 （1.50.25）4 5.61.01= 4.20.1 4.23.5二列豎式62961=4.82.3 6.490.58=0.271.1（得數保留兩位小數）（得數保留一位小數） （得數保留兩位小數） （得數保留兩位小數）三脫式計算9.28（2.1-1.7）2.5 1.255.78 100.22.5 5.612.5一口算2.140.9 2745673= 120.3= 2.870.7 134244564= 7.21.2=3.86100=3.90.01=98.4100=二豎式11.55=13.62=19.53= 12.612=三脫式計算3.250.21.561.7+0.441.711.72-7.85-1.721.825+122.5一口算9.11.3= 8.210= 1-0.45= 36+2.45= 0.480=0.427=0.691= 1.210.6=0.50.2=8.42.1=二豎式計算28.824=20.44=96.642= 264=三脫式計算2.6（2.1399.36.2） （18.4+27.834.6）0.2 2.61.92.61.94.264(0.1620.5)一口算761000= 8.7-5= 1.288= 4025= 0.51100= 0.5899=0.60.9= 0.10.5= 0.520.52= 12.4-（2.4+3.25）=二豎式計算55.831=82.515= 82.525= 18.96=三脫式計算0.5623.792.6 8.451.32.6 9.42+2.80.25 5.4（2.74）一口算12.50.50.4= 1084184= 2.6+3.1-2.6+3.1= 73425= 10+0.08= 1-0.95= 0.3+0.27= 0.47+0.13= 4.5+4= 4-0.6=二豎式計算62961= 4.82.36.490.58=0.271.1（得數保留兩位小數）（得數保留一位小數） （得數保留兩位小數） （得數保留兩位小數）三脫式計算39.6(1.8+1.5)2.4323.2+2.6 40.22.716.2 （24.832）7一口算0.95+0.05= 2.5+3.2= 0.74+0.16= 23100= 9.8-4.8= 48040= 0.53100= 5.1+2.3= 12580= 0.07810= 二豎式計算2.70.32=3556=0.366.9=15.3612=三脫式計算7.32-4.370.84.050.050.817.620.16-0.16 8.75（12.57）一口算