四年级小数简便运算及答案.pptx

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1、67.687.32.7 3.651.280.371.7719.8261.1735.2483.405 130.835.9+5.923.97+0.9+6.8 23.9+6.783.9 31.6121.271.61=67.68(7.3+2.7)=67.6810=57.68=3.65(1.28+0.37)1.77=3.651.65 1.77=0.23=19.826(1.173+5.248+3.405)=19.8269.826=10=130.8(35.95.9)=130.830=100.8=23.97+1+70.3=31.970.3=31.67=23.93.9+6.78=20+6.78=26.78=31

2、.611.61 21.27=3021.27=8.73第1页/共13页27.64(5.79+1.64)23.12(10.123.67)20.65(17.11.35)32.75+(15.2510.68)30.1623.28+15.28 0.254.784 0.982.5=27.641.64 5.79=265.79=20.21=23.1210.12+3.67=13+3.67=16.67=20.65+1.3517.1=2217.1=4.9=32.75+15.2510.68=4810.68=37.32=30.16(23.2815.28)=30.168=22.16=0.2544.78=14.78=4.78

3、=(10.02)2.5=12.50.022.5=2.50.05=2.45第2页/共13页4.520.45+5.480.45 423.9 1.499+1.40.2573.6 1.25131.6 10.20.412.512.532 4267+4.2330 8.37168=0.257(40.9）=0.25470.9=170.9=6.3=1.2513(80.2）=1.258130.2=10130.2=26=(10+0.2）0.41=100.41+0.20.41=4.1+0.082=4.182=(4.52+5.48）0.45=100.45=4.5=42(40.1）=424420.1=1684.2=163

4、.8=1.4(99+1）=1.4100=140=2.512.5(84）=(2.54)(12.58)=10100=1000=4267+4233=42(67+33）=42100=4200=8.37(168）=8.372=16.74第3页/共13页28.70.35 3102.54 11.2 9.62.4560(1408)5.674 910.1252.384.1+5.82.38+0.238 28.71.628.7=28.7(0.70.5）=28.70.70.5=410.5=82=310(2.54）=31010=31=11.2(9.62.4）=11.24=2.8=5601408=48=32=5.647=

5、1.47=9.8=(918)(0.1258）=7281=728=2.384.1+5.82.38+2.380.1=2.38(4.1+5.8+0.1）=2.3810=23.8=28.728.71.6=11.6=1.6第4页/共13页110.25100.25 (80+5.6)8 =(11 10)0.25=10.25=4=808+5.68=10+0.7=10.77.8(1.0010.26)0.26 3.5+17.899+14.31009.50.98+9.52 2811.11+99.998=7.81.001(0.260.26)=7.81.001=7.8078=(3.5+14.3)+17.899=17.8

6、(1+99）=17.8100=1780=1000.989.5+9.52=9.5(98+2）=9.5100=950=2811.11+11.1198=2811.11+11.11(98)=11.11(28+72）=11.11100=1111第5页/共13页7.618+2.32.4 1.628(3.622.37)0.387.6+0.382.5+0.382 362.54+1.849.21994+199.4+19.94+1.994=1.6281.25=1.62(81.25）=1.6210=0.162=0.387.6+0.380.4+0.382=0.38(7.6+0.4+2)=0.3810=3.8=1.82

7、02.54+1.849.2=1.8(202.54)+1.849.2=1.8(50.8+49.2)=1.8100=180=2000+200+20+260.60.060.006=22226.666=2215.334=0.71+(22)0.7+0.73+20.7=0.7(1+4+3+2)=0.710=70.7+21.4+2.1+20.7第6页/共13页(0.37510137.5)37.5 1.11.1111.11.11.119991998199819981999199949.513.50.549.5+50.513=0.375(1011)37.5=0.37510037.5=37.537.5=1=1.1

8、1.1(111)1.1=1.1111.1=1.1(111)=11=19991998100011998199910001=0999999+1999=999(10001)+1999=99910001999+1999=999000999+1999=1000000=49.5(13.50.5)+50.513=49.513+50.513=(49.5+50.5)13=1300 11136+8888=11136+11188=111(36+64)=11100第7页/共13页9898+979798979796 880.125123498761233987798+979695+94+939291+6+543+2+1

9、=98989897+97979796=98(9897)+97(9796)=981+971=197=(80+8)0.125=800.125+80.125=10+1=11=12339876+19876(12339876+12331)=98761233=8643(8.4+8.4+8.4+8.4)2.5=8.442.5=8.4(42.5)=84=(98+979695)+(94+939291)+(6+543)+2+1=4(982)4+2+1=424+2+1=99第8页/共13页0.9+0.99+0.999+0.9999 12.90.72+43.53.60.2688.882.684.44 1.1+1.3+

10、1.5+9.7+9.9117.82.34.880.23 3333333333=(1+1+1+1)(0.1+0.01+0.001+0.0001)=40.1111=3.8889=(12.95)(0.725)+43.53.6=64.53.6+43.53.6=(64.5+43.5)3.6=30=(0.2682.68)(8.884.44)=0.12=0.2=(1.1+9.9)245=5.545=247.5=117.82.348.82.3=(117.848.8)2.3=692.3=30第9页/共13页0.2250.335+0.3350.775+0.7750.225 199227.5+198272.5 96

11、3.2251.616+0.436 1472+4276=(1982+10)27.5+198272.5=1982(27.5+72.5)+1027.5=198200+275=198475=96(0.8425)=9680=1.2=0.4416+0.436=0.4(416)+0.436=0.4(64+36)=40=143(723)+4276=4224+4276=42(24+76)=4200第10页/共13页5096+574+766 399.6919980.86543211234566543221234552003200220002200220032003=399.69199820.4=399.69399.64=399.65=1998第11页/共13页第12页/共13页感谢您的观看。第13页/共13页