青岛版四年级下册口算题大全（全册各类完整15份）.docx

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1、3+57=57+()80+94=94+()75+13=13+()87+43=( )+876+(8+7)=( )+8+78+(7+6)=8+7+()3+(9+6)=3+9+()4+5+6=4+(+6)4+5+3=4+(+3)(5+4)+9=5+(4+)(7+6)+5=7+(6+)()+75=75+94()+(5+9)=3+5+9()+(3+7)=9+3+7()+9+6=3+(9+6)(+7)+6=9+(7+6)43+( )=98+4352+( )=13+527+( )+4=7+(8+4)2+8+( )=2+(8+3)98+29=()+9847+97=97+()65+84=()+65 9+6+8=

2、()+(6+8)6+(4+8)=6+( )+83+(7+8)=3+( )+8 4+(3+9)=4+3+() 9+3+5=9+(+5) 5+9+3=5+(9+) (3+8)+6=3+(+6) ()+70=70+83 ()+89=89+97 ()+2+7=4+(2+7) ()+(3+7)=5+3+7 ()+5+9=6+(5+9)3+( )=40+388+()=65+882+6+( )=2+(6+7)2+4+( )=2+(4+5)3+( )+5=3+(7+5)TO： _44+30=30+()85+87=()+8572+86=86+()8+(3+9)=()+3+95+(8+4)=( )+8+47+6+

3、2=()+(6+2)2+(9+8)=()+9+87+8+4=7+(+4) (2+7)+4=2+(+4) (2+3)+6=2+(3+) ()+25=25+54()+9+8=7+(9+8)()+(6+3)=2+6+3()+(8+4)=6+8+4()+4+2=7+(4+2)47+( )=5+4778+( )=61+785+( )+3=5+(4+3)4+9+( )=4+(9+3)7+( )+8=7+(2+8)算练习-乘法分配律 总题数：100题2x43+8x43 0 10x434x39+6x39 0 10x398x69+2x69 0 10x697x37+3x37 0 10x3712x6+12x4 0

4、12x1042x6+42x4 042x(6+4)18x8+18x2 0 18x(8+2) 39x3 + 39x7 0 39x(3+7) 71x2+71x8 0 71x(2+8) 26x7+26x3 0 26x(7+3)嬲：等级:92x4+92x6 O 92x10 62x6+62x40 62x10 16x8+16x2 0 16x10 23x7+23x3023x1079x7+79x3 O 79x1085x6+85x4 0 85x(6+4)85x7+85x3 0 85x(7+3)43x7+43x3 O 43x(7 + 3)29x3+29x7 0 29x(3+7)7x73+7x27 0 7x(73+2

5、7)峨：物:算练习-乘法简便计算 总题数：100题5x25x4=25x3x4=5x87x2=3x4x25 =7x25x4 =2x22x5 =82+9x82二55+9x55=125x6x8=3x125x8=9x8x125=7x8x125=5102+5=99x59+59二32+32x99二5100-25-4=3700-25-4=6200-25-4=40001258二5000-8-125=25x8x4=58x2x5=63x2x5=5x66x2=90-5-2=9x99+99=32x9+32=14+9x14=3x8x125=210-2-5=125x2x8=510-5-2=2x8x125=65x99+65

6、=98x99+98二2300-4-25=4900+25+4=5300-25-4=9000-1258=6000-8-125=4x6x25=2x4x25=5x67x2=82x2x5=26x5x2=36x9+36二94x9+94二64+9x64=720-2-5=125x5x8=140+5+2=4x8x125=23x99+23=11+99x11=44+99x44二5600-4-25=5400-25-4=7000-8-125=3000-8-125=60001258=78x2x5=4x7x25=25x7x4=43x2x5=4x4x25=52x9+52=72+72x9=960-5-2=230-5-2=8x3

7、x125=7402+5=930-2-5=88x99+88=68+68x99=99x48+48二9700-4-25=5800-4-25=2000-125-8=8000-125-8=70001258=口算练习-乘法简便计算总题数：100题M：物:19x27-9x27=58x16-6x58=43x15-43x5=13x26-26x3=12x59-2x59=16x77-77x6=75x19-9x75=17x73-7x73=17x93-93x7=68x17-7x68=24x18-24x8=16x66-6x66=33x13-33x3=37x15-5x37=14x12-2x14=46x16-46x6=14x

8、11-4x11=13x61-61x3=17x74-7x74=18x44-44x8=峨：物：一3+78+2=28+5+52=39+14+6=8+53+17二2x67x5=95x5x2=2x89x5=78x5x2=5x37x2=5x28x2=56+56x9=27x9+27=103-5-95=123-98-2=17+14+33=930+2+5=2802+5=34+34x99二91x99+91=111-60-40=79+3+7=6+49+34二43+8+12=59+34+6=64+9+11=57x2x5=78x2x5=2x53x5=60-5-2=2x94x5 =39+39x9=21x9+21=65+6

9、5x9=184-97-3=129-92-8=640+2+5=610-5-2=84+84x99=99x67+67=24+99x24=嬲：物：149-54-46=116-84-16=4+20+80+76=5600+4+25=118-45-5-50=80+20+13+47=80+36+14+20=16+90+10+64二24+46+80+20二2000125+8=3000-125-8=13x96-96x3=31x12-31x2=18x55-8x55=15x63-63x5=15x96-5x96=120-35-15-50=123-30-10-60=104-45-45-10=138-45-35-20=13

10、7-71-29=105-10-90=164-73-27=15004+25=135-45-5-50=70+43+47+30=31+49+10+90二25+55+80+20=15+50+50+45=70+22+30+48=3000-8125=32x19-32x9=16x61-61x6=28x13-3x28=22x13-22x3=12x68-68x2=104-25-35-40=106-45-25-30=112-15-35-50=113-35-45-20=51+33=33+()(2 + 6)x5 = 2x() + 6x548x125=40x125+8x()(4+5)x25 = ( )x25 + 5x2

11、5 86x125=( )x125+6x125 7+2+( )=7+(2+5)4+( )+6=4+(5+6)25+58 0 58+2598+37 0 37+98(46x5)x2 046x(5x2)w：物:8+5+3=( )+(5+3) (2+25)x4=2x4+( )x4 87x125=80x( )+7xl2566x2 + 66x8=66x(+8)88+( )=80+883+9+()=3+(9+2)4+7+( )=4+(7+2)31+32 O 32+31(48x5)x2 048x(5x2) (43x4)x25 043x(4x25)2.2 O 3.31.5 O 0.68.7 O 8.85.2 O

12、4.51.2 O 137.6 O 8.21.1 O 0.333 O 4.90.23 O 0.32632 O 6.232.882 O 2.80.7 O 0.7615.35 O 5.537.96 O 7.693.55 O 3.5573.544 O 3.573.196 O 3.161.686 O 1.865.81 O 5.8038.85 O 8.8454.1 O 4.29.9 O 9.83.3 O 2.35.9 O 6.76.1 O 6.24.7 O 5.61.3 O 1.91.9 O 1.53.1 O 3.1231.38 O 1.830.49 O 0.944.976 O 4.98.43 O 8.3

13、47.976 O 7.91.52 O 1.5944.71 O 4.7049.71 O 9.7148.97 O 8.9143.15 O 3.1148.861 O 8.82班级：等级:6.9 O 5.58.5 O 9.74.4 O 4.39.5 O 9.683 O 8.61.6 O 1.35.5 O 6.34.9 O 4.86.58 O 6.850.3 O 0.3967.72 O 7.270.62 O 0.266.75 O 6.574.4 O 4.4297.85 O 7.5825.69 O 5.9635.28 O 5.2725.48 O 5.8442.64 O 2.4698.252 O 8.236

14、.5 O 6.62.8 O 2.25.9 O 6.77.5 O 6.99.7 O 8.80.7 O 0.88.1 O 7.97.8 O 7.62.86 O 2.689.41 O 9.145.92 O 5.295.81 O 5.186.14 O 6.419.13 O 9313.18 O 3.1733.87 O 3.7810.348 O 0.432.41 O 2.4645.37 O 5.7348.25 O 8.5247.9 O 6.68.4 O 8.65.1 O 5.92.6 O 2.87.9 O 7.44.2 O 3.67.1 O 6.50.7 O 1.63.7 O 3.7691.12 O 1.

15、215.122 O 5.17.42 O 7.243.29 O 3.926.441 O 6.42.056 O 2.061.43 O 13451.57 O 1.5675.304 O 5.319.906 O 9.911.776 O 1.78口算练习-小数点位置移动引起小数大小的变化 总题数：100题峨：物：一85110=38910二167-10=57.9x10=11.4+10=5.88x10=73.2-10=87.7x10=8.39x10=751000二461-100=571100=212100=756-100=8.85x100=5.7x1000=856-1000=486-1000=0.164x10

16、0=0.483x100=0.8x10=193-10=441-10=211-10=49.8-10=67.2x10=86.2x10=34.8x10=8.22x10=4.02x10=910-100=571100二573100=259100=612-100=0.541x10=0.273x10=803-1000=7691000=4.46x1000=1.54-10=31-100=104-10=578-10=4.06x10=3.1x100=7.95x10=44.2-10=7.82x10=748-100=150-100=537-100=187-100=514-100=238-100=0.359x10=0.45

17、1x10=356-1000=267-1000=4.32x1000=4.3-10=949-10=495-10=86.3-10=78.9+10=56.6x10=62.6x10=76.5-10=45.5-10=461100二76-1000=130:100=658100二727-100=6.5x1000=2.62x100=0.451x10=274-1000=207-1000=0.343x100=0.575x100=0.2x10000=0.105x1000=0.952x1000=0.512x10000=0.4x10000=0.172x100=0.416x1000=0.288x10000=0.773x10

18、000=0.251x100= 0.12x10000= 0.831x1000= 0.915x10000= 0.984x10000=0.899x100= 0.677x1000= 0.292x1000= 0.512x10000= 0.858x10000=算练习-小数的改写总题数:100题腋：物：4.9t =()kg1.7kg = ( )g1.5kg 二()g1.8kg = ( )g0.8kg = ( )g5.2kg = ( )g4.3kg = ( )g5.8kg = ( )g6.7kg = ( )g560kg =()t5.53t =()kg8.31t =()kg9.24t = ( )kg0.42t

19、= ( )kg0.21t = ( )kg8.36t =()kg8.58t = ( )kg6t40kg = ( )t14dm = ( )m6.63 kg = ()g9.12kg = ( )g6.15kg = ( )g0.14kg =()g9120kg =()t7050kg = ( )t9930kg = ( )t3640kg = ( )t5.6m = ( )dm6570g = ( )kg6930g = ( )kg5460g =()kg3360g = ( )kg6230g = ( )kg680cm = ( )m250cm = ( )m590cm = ( )m5t290kg = ( )t78cm =

20、( )dm430cm = ( )m3t290kg =()t8t350kg = ( )t2t860kg =()t106dm = ( )m549dm = ( )m207dm = ( )m2.56m =( )cm9.41m = ( )cm6.5dm = ( )cm9.9dm =()cm5.95m = ( )cm4.9dm = ( )cm9.43 km = ( )m0.71km = ( )m3.31km = ( )m997cm = ( )dm226cm = ( )dm979cm = ( )dm572cm = ( )dm888cm = ( )dm448cm = ( )dm2+(9+)=2+9+65+(7

21、+)=5+7+3(5+9)+()=5+(9+8)(3+6)+( )=3+(6+8)96+34 O 34+9680+72 O 72+8031+32 0 32+313+6+7 0 3+(6+7)8+(2+6) 0 8+2+65+(2+7) 0 5+2+7(8+2)4-70 8+(2+7)(2+9)+8 O 2+(9+8)(2+7)+9。2+(7+9)(6+8)+4O6+(8+4)4+(+5)=4+9+5 7+(9+)=7+9+5 (2+9)+( )=2+(9+3) 8+10 0 10+856+62 O 62+5677+66 O 66+7730+26 0 26+30 5+6+9。5+(6+9) 6+

22、4+5。6+(4+5) 7+5+2。7+(5+2)(4+6)+2。4+(6+2) (6+5)+4 0 6+(5+4) (7+6)+4O7+(6+4)TO： _7+(3+)=7+3+26+(+3)=6+5+3 (3+8)+()=3+(8+2)41+5 0 5+4111+84 O 84+1149+67 O 67+49 7+(4+3) 0 7+4+3 9+(8+3) 0 9+8+3 2+(3+5)0 2+3+5 7+(2+3) 0 7+2+3 (2+6)+4 0 2+(6+4) (5+8)+6 0 5+(8+6) (7+3)+8。7+(3+8)口算练习-小数的改写 总题数:100题1990m = (

23、 )km 3160m = ( )km 3m72cm = ( )m 2.4dm2=()cm2 0.42m2 = ( )dm2 0.78dm2 = ( )cm2 5km340m = ( )km 4.2kg 0 4320g 968cm O 9.6m1.4m O 147cm 568cm 0 5.6m 112g 0 0.112kg 427cm 0 4.26m 546m O 0.546km腋：_7970m = ( )km 4120m = ( )km170dm2 = ( )m24.27m2 = ( )dm2 307cm2 = ( )dm22.07dm2=()cm2 3kml70m = ( )km9.8kg

24、O 9790g428cm O 4.2m869cm。8.6m782cm。7.8m 0.613kg 0 613g 0.775km 0 775m5860m = ( )km 3m51cm = ( )m 507dm2 = ( )m2 5.92m2 =()dm2 9km20m = ( )km 0.45dm2=()cm2 6.3kg O 6410g7.2kg O 7390g6.6m O 667cm2.1m O 211cm 0.587kg 0 587g 621cm O 6.22m 0.368km O 368m算练习-单元综合练习 总题数：100题402-10=67910二30.6+10=92.5x10=72.

25、4x10= 968-100= 0.378x10= 0.85x1000= 5.52x1000= 0.677x1000=8.6t =()kg2.94t = ( )kg 5830kg =()t9.9m = ( )dm 2t840kg =()t 0.2dm = ( )cm 3080m = ( )km1.5m2 = ( )dm2 3m36cm = ( )m 916cm2 = ( )dm229610=119-10=94.6x10=2.78x10=2.76x10=745100二664-1000=7.08x1000=0.071x100=0.545x10000=8.57t =()kg0.45t =()kg297

26、0kg =()t3240g =()kg449dm =()m9.26m =()cm1260m =()km43cm2 =()dm2179dm2 =()m2689cm2 =()dm2w： 物:39110=74.5-10=7.26x10=57.7x10= 546-100= 4.59x100= 0.16x1000= 8.75x1000= 0.8x10000= 0.755x10000= 836t =()kg 0.48kg = ( )g 3.4m = ( )dm 8210g =()kg2.47m = ( )cm 637cm = ( )dm 9760m = ( )km 2ml6cm = ( )m 320dm2

27、 = ( )m2 391cm2 =()dm2算练习-单元综合练习 总题数：100题405cm2 = ( )dm2 1.87dm2= ( )cm2 4km450m = ( )km 3km350m = ( )km 2.7 O 2.1 5.1 O 5.2 7.4 O 7.33.25 O 3.529.23 O 9327 0.627 O 0.26 8.1kg 0 8280g 325cm。3.2m 695g 0 0.695kg 776m O 0.776km5km30m = ( )km9km750m =()km3km380m = ( )km9.3 O 8.47.3 O 7.21.6 O 1.29.9 O 9

28、.74.73 O 4.379.452 O 9.493.247 O 3.425.5kg O 5630g796cm。7.9m0.396kg 0 396g飒微：5.63dm2 = ( )cm29km210m =()km3km220m = ( )km0.9 O 0.74.7 O 4.57.3 O 7.58.4 O 8.4968.1 O 8.1372.93 O 2.3977.449 O 7.497.7m O 773cm415g。0.415kg864m O 0.864km口算练习-小数的加减法总题数：100题腋： 物:7.4-4=87.9-4=0.3+58=1.8+95=82+2.9 二3.87+2=1.

29、2+91=5+0.45=0.76+8=4.7+14=3.4+33二5.86-2.7=25.7-3.3=47.4-7.2=91.6-0.3=84.5-3.1=6.51-5.3=26.5-1.3=76.2-0.2=25.6-0.5=71.7-1.1=89.7-4.3=46.9-1.6=17.3-3.1=64.9-2.4=98.4-7.1=61.7-0.2=72.9-1.4=25.9-3.3=9.96-5.5=2.97-0.4=55.9-0.2=83.4-1.2=0.45+4.4=14.3+0.7=3.3+92.5 二9.1+0.39 二4.1+0.72=2.2+5.34二2.6+1.13=44.2

30、+0.3=13.7+1.2=91.2+6.6=1.1+31.7=80.5+0.2=0.02+6.8=80.2+2.2=76.1+2.9=7.4+91.4=83.4+2.4 二1.6+64.4=27.2+1.8=8.24+1.7=3.24+4.6 二0.5+8.47=1.9+21.1=二9.64-1.11=6.97-3.26=6.53-1.11=7.47-5.34=6.74-6.04=9.77-8.42=6.66-2.21=8.59-2.21=936-1.06=7.49-0.11=4.97-2.46=8.29-3.08=6.94-5.24=9.97-2.87=5.86-4.04=4.26-2.1

31、3=4.87-0.72=8.19-7.15=1.29-0.03=6.44-5.43=3.67-1.05=6.24-3.01=6.63-3.01=8.95-7.14=8.91-6.91=1.34+0.64=5.13+1.72=2.05+0.43=4.51+4.01=2.08+5.41=6.11+2.58=6.04+0.61二6.65+1.04=3.34+2.51 二1.24+8.63 二1.46+7.53=4.02+1.67=0.71+4.02=7.83+1.03=015+074=2.64+0.22=0.12+4.76=0.75+8.02=4.6-2-1.6=8.4-2-61=5.1+33-8=

32、8.4-61+2=7.8-3.5+5=11+3.4-4=43+4.6-3=57-5.1+4=2.8-03+7=4.4-11+3=43+1.5-2=43+3.6-3=6.4+15-1=43+3.6-3=77-0.7+2=6.8-43+6=44+4.2-7 二9.5-93+5=5.4+21-2=41+0.6-1=8.6-82+9=21+4.6-3=1.4+4+21=57+3+1.2=2+3.4+23=1.1+41+2=07+5.1+3=17+1.1+3=34+0.4+5=5+21+2.7=2+53+2.6 二5+11+3.6=63+0.2+3=23+4+1.3=9.8-(3.8-3)=6-(4.9

33、-0.9)=1.1-(3.1-3)=9-(8.6-3.6)=4-(4.6-1.6)=8-(6.4-2.4)=8.8-(7.8-2)=7.8-(0.1+7)=6.4-41-2.2=7.9-3.5-21=6.4-1.2-0.2=2.9-2.4-03=9.9-8.4-11=7.8-4.1-27=7.3-(3.2+4)=77-2.2-4.2=9.5-13-0.2=9.6-21-4.2=3.9-0.5-03=9.9-07-6.1=8.6-11-5.5=8.8-03-1.2=67-2.5-3.1=8.8-03-1.2=33-0.2-2.1=6.4-41-1.1=6.9-13-4.1=7.8-(0.3+7)

34、=03+4.5+5.1=2.2+5.5+12=03+0.2+9.4=03+4.1+4.1=53+0.2+3.3=0.4+04+9.1=21+3.4+3.1=2.2+2.1+13=5.6-(6.9-63)=33-(4.6-33)=4.2-(4.9-1.7)=5.3-(9.5-8.2)=4.2-(6.5-5.3)=9.4-(4.9-0.5)=2.1-(4.2-4.1)=5.6-(7.7-6.1)=4.5-(8.8-7.3)=6.6-(9.7-6.1)=口算练习-小数加减混合运算 总题数：100题W：物:算练习-小数加减混合运算总题数：100题班级:物:1.7-(0.9-0.2)=8.8-(2.3+

35、6.4)=9.9-(5.2+4.2)=2.7-(1.2+1.4)=8.9-(7.2+1.5)=5.5-(7.6-3.1)=7.6-(7.1+0.4)=8.8-(2.3+6.4)=9.8-(2.5+7.2)=7.9-(0.3+7.1)=5.6 - (6.9 - 6.3)=5.7-(1.1+4.4)=9.5-(5.2+4.2)=8.9-(7.2+1.5)=6.9-(4.4+2.2)二6.9-(6.4+0.2)二8.9-(33+53)=9.6-(8.2+13)=6.9-(4.6+2.1)=8.4-(1.2+7.1)=口算练习-整数加法运算定律推广到小数 总题数：100题9.4-61-2.9=9.6-

36、1.5-11=5.6-0.5-11=9.5-0.2-23=57-2.9+2.2=3.6+7.1-21=4.5+61-1.5=5.9+72+4.1=93+4.1+5.9=1.4+18+8.6=61+9.8+0.2=93+3.2+0.7=1.6+63+3.7=5.9+7.2+41= 33+1.1+1.7+3.9=0.2+0.3+3.8+1.7 =1.9+61+0.8+0.2=3.6+1.3+4.4+17=2.2+41+3.9+1.8=4.2+18+0.5+0.5=63-2.4-3.6=9.9-3.5-5.4=87-0.3-6.4=3.1+85-3.5=3.4+67-2.7=4.3+49-1.9 二

37、0.8+8.7-77=9.5+53+0.5=4.4+7.7+23=1.9+2.5+81=5.7+44+5.6 二8.2+97+1.8=41+6.8+3.2=1.5+6.6+2.4+15=2.6+81+0.4+0.9=0.4+4.2+6.8+0.6=0.6+42+0.8+2.4=15+0.5+2.2+7.8=1.2+0.7+53+2.8=51+2.9+0.2+2.8=w：物;43-2.1-1.9=97-7.1-0.6=93-2.2-1.1=27+9.4-6.4=2.3+7.2-03=7.2+4.5-32=61+9.8+0.2=8.8+63+1.2=57+4.2+5.8=0.8+9.6+04=4.

38、6+85+5.4=3.8+93+6.2=8.5+3.1+6.9=5.1+13+0.9+4.7=3.6+13+4.4+1.7=0.9+1.7+03+5.1=1.9+61+0.8+0.2=33+4.1+0.9+0.7=4.2+0.8+0.5+1.5 二4.8+03+6.7+0.2=口算练习-整数加法运算定律推广到小数 总题数：100题11+2.6+6.4+1.9=7.4+03+2.7+0.6=3.5+15+2.8+2.2=3.8+0.3+2.7+3.2=0.4+1.6+13+6.7=1.1+2.7+2.9+13=1.5+3.5+1.8+0.2=9.7+5.1=5.1+()0.7+1.8=( )+0

39、.72.4+( )=6.9+2.424+8.9 O 8.9+2443+9.4 O 9.4+4378+9.5 O 9.5+7.86.4+1.6 O 1.6+6.41.5+2.8+32+3.5=11+1.8+5.9+1.2=1.14-2.6+6.4+1.9=1.5+6.4+0.6+1.5二51+1.4+4.6+0.9=4.2+0.8+0.5+15=2.4+0.8+42+1.6=1.6+4.6=4.6+()8.8+()=2.4+8.80.7+( )=7.7+0.76.9+7.9 O 7.9+690.2+7.9 O 7.9+0.22.4+1.5 O 1.5+2.4w：物:0.9+6.8+3.2+11=

40、1.6+7.8+2.2+04=6.7+0.5+0.5+0.3=2.1+2.6+1.9+24=37+2.9+2.1+2.3=03+0.9+1.7+3.1=8.7+5.8=5.8+()9.2+1.1=1.1+()9.9+()=9.7+9.97.1+( )=5.2+7.13.8+57 O 57+3.86.9+1.9 O 1.9+6.94S+7.9 O 79+4.9口算练习-单元综合练习 总题数：100题嬲： 等级:12910=377-10=67610=19.8-8.1=33.2+1.4=28.8x10=4+69+11=32.6x10=18+26+4=3x25x4 =88x5x2=43x5x2=4x9

41、x25 =53x2x5=2x36x5=73x2x5=134100=93+93x9=64+64x9二45+45x9=9.66-0.14=7.09-0.06=41x9+41=6.49-4.13 二69+9x69二9.98-8.67=5.16-0.15=9x13+13=48+48x9=54+54x9二3.03+5.12=5.21+3.63=211+2.32=0.787x10=4x8x125=3x8x125=520-2-5=62+62x99=155-71-29=156-75-25=7.64x1000=5.1-0.8+07=1.6+65-4.5=0.2+2.4-0.4 二7.1-3.2+11=6.4+6

42、.9-3.9=9.2+2.6+0.8 =4.6+55+5.4=0.4+4.5+5.5=2.9+1.5+71=(8-2)x9-2 =(7-3)x9-6 =(8-4)x6-3 =(8-4)x3-6 =(8-5)x8 + 2 二30+13+7+70=80+75+20+5=20 + (97)x4 二20-(8-6)x2 =50-(5 + 5)x5 =算练习-单元综合练习 总题数：100题90-(2 + 8)x3 =0.996x10000=40-(3 + 7)x4 =30-(5 + 5)x9 = 60+18+72+40=50+12-(9-7)=124-40-10-50=0.8dm =()cm2.7dm2 = ( )cm29.3 O 9.61.3 O 1,3137.92 O 7.9526.39 O 6.394 23km O 2260m0.721x10000=90-(4 + 6)x5 = 70-(3+7)x5 = 57+50+33+50=60+12-(5-3)= 17x62-62x7=0.8+4.3+6.2+0.7 = 3.76km =()m 4.95m2 = ( )dm2 2.71 O 2.177.3 O