小数加减法专项练习(200题)含答案

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1、 小数加减法-1 小数加减法专项练习 200 题(有答案)(1)7.4+12.86(2)205.674(3)141.248.98(4)102+4.36(5)32.1527.45(6)12.9+5.01(7)29.46(9.46+3.8)(8)15.75+0.652.75+3.35(9)65.714.99(10)12.42+0.48(11)0.56+11.534(12)4422.13(13)9122.035(14)52.6+21.237(15)9.152.18(16)3.851.5+1.32,(17)15.4+6.87(18)3.56+27.84 小数加减法-2(19)10082.13=17.8

2、7(20)123.5647.9+51.7(21)2.7+3.1+2.9+3.2,(22)28.42+19.48(23)42.56+3.124(24)8130.75(25)15.6 十 0.237(26)148.225.6224.38(27)4.520.740.26(28)0.42+5.4+1.58+2.6(29)5.9+28.6516.57(30)57.53.2516.75,(31)6.02+3.6+1.98(32)1.29+3.7+2.71+6.3(33)3.070.381.62(34)3.25+1.790.59+1.75(35)7.5+4.96.1(36)14.8+7.94.8(37)2.

3、608+2.84(38)6.073.869 小数加减法-3(39)1.50.306(40)76.8+26.82(41)102.0737.257(42)48.64+18.6(43)54.755.2514.75,(44)4.68+14.79+5.3210.79,(45)48.912.70.3,(46)56.439.7+24.3,(47)3.62.8+3.47.2,(48)3.67+18.5+6.33,(49)12017.832.17,(50)17.176.83.26.17(51)73.81.6413.85.36(52)6.75(0.9+3.75)(53)27.385.34+2.624.66 (54

4、)35.724.9(5.72+5.1)(55)0.730.250.73+0.25 (56)5.3+0.1+5.30.1 (57)12.74.85.2(58)23.256.753.25 小数加减法-4(59)4.58+2.39+(5.42+7.61)(60)9.053.863.14(61)209.180.82(62)6.53(1.53+2.6)(63)5.521.0740.926(64)4.21+1.04+0.79(65)1.36+4.85+2.64+6.15(66)83.712.830.17(67)4.32+5.43+6.68(68)17.176.83.2,(69)1+12.7+5.9+17.

5、3(70)27042.517.5(71)15.68(7.784.32)2.32,(72)0.9+9.9+99.9+999.9,(73)25.468.231.76,(74)9.4+0.36.4,(75)15.25+4.72+4.75+5.28,(76)34.823(4.82+15.2),(77)12.74.85.2,(78)3.1+25.78+6.9,小数加减法-5(79)73.81.6413.85.36,(80)2.15+8.73+1.27+7.85(81)11.87(8.2+1.87),(82)5.423.871.13,(83)4.381.56+0.620.44,(84)46.715.034

6、.97(85)4.52+0.61+1.39+6.48(86)4.27(1.961.73)(87)7.27(1.98+0.27),(88)13.7+8.659.628,(89)12.8(4.38+1.614)(90)15.17(3.6+4.9),(91)35.6+(12.64.4),(92)16.4+3.5+83.6+166.5(93)4.652.551.45,(94)1.28+0.86+38.72,(95)25.743.576.43,(96)14.54.685.32,(97)0.485+0.64+3.36,(98)72.519.3412.66,小数加减法-6(99)14.024.5+0.98,

7、(100)5.76+2.43+0.24+10.57,(101)9.28(3.28+2.55),(102)9.5+4.856.13,(103)10.751.862.753.16,(104)1.3+0.94+0.06+7.7,(105)4.45+0.63+5.55,(106)45.5(0.98+5.5),(107)0.960.28+0.040.72,(108)12.7+12.5+0.5,(109)0.6+0.940.208,(110)27.73(4.731.85),(111)3.84+26.5(208.6),(112)7.385.14+3.622.86,(113)5.86+13.089.27,(1

8、14)25.4(15.46.4),(115)47.237.235.89,(116)4.45+0.63+5.55,(117)5.28(2.9+1.28),(118)5.25+7.862.86+4.75,小数加减法-7(119)0.960.28+0.040.72,(120)9.42+7.39+1.58,(121)18.41.65.4,(122)75.7+39.423.86,(123)21.21+38.389.79,(124)47.28+1.39+52.72,(125)2.451.68+1.54,(126)158.131.87,(127)5.14+3.2256.302,(128)3.95+5.361

9、.95,(129)13.67(5.45+3.67),(130)4.26+5.481.26+4.52,(131)14.67+25.91+15.33+4.09,(132)10.75(2.40.86),(133)9.614.38+0.35,(134)3.87+4.92+1.13,(135)46.248.661.34,(136)21.99.220.78+8.1,(137)35.47+39.8812.37,(138)93.215.9914.01,小数加减法-8(139)15.37+28.94+4.63+1.06,(140)42.37(12.379.78),(141)38.7819.59+41.2230.

10、41,(142)1.9+19.9+199.9+0.3(143)429+31.1+2.04,(144)10027.242.8,(145)9(3.02+1.25),(146)1.81.57+0.2,(147)5.032.5+0.96,(148)35.72(5.9+5.72),(149)254.7+5.3,(150)1.3+2.83+8.7+0.17,(151)2.472.23.8+7.53,(152)6.89+4.7+2.11+5.3,(153)7.462.371.63,(154)14(3.65+0.24),(155)70.81.251.75,(156)5.81+8.3+4.19+11.7,(15

11、7)4.2+7.64+5.8+2.36,(158)14.282.637.37,小数加减法-9(159)6.8+5.26+3.74+3.2,(160)6.213.8+2.2,(161)6.03+3.7+2.97,(162)17.436.572.43,(163)20.47(1.47+6.8),(164)13.26+4.71+3.47+5.29,(165)22.74+8.6813.74,(166)12.566.643.36,(167)45.5(0.98+5.5),(168)13.6+7.94+6.4,(169)15.19+3.36+4.64+4.81,(170)4.7+7.69+5.3+2.31,(

12、171)53.7813.637.4+6.22,(172)60(21.58.8)+7.3,(173)9.5+4.856.13,(174)75.8(15.34.8),(175)51.278.661.34,(176)28.43.961.04+4.6,(177)70.87.251.75(178)5.81+8.3+4.19+11.7 小数加减法-10(179)794198,(180)6756193207,(181)0.9+1.08+0.92+0.1,(182)13.596.910.09,(183)4.58+3.38+(5.48+6.62)(184)73.75(4.3+8.75)(185)5(4.192.

13、83),(186)1.39+0.72+0.61+3.28,(187)83.76.3,(188)8.28(1.28+3.7),(189)15.377.59+5.7312.41,(190)11.727.85(1.26+0.46),(191)15.37+28.44+12.56,(192)12.64(3.96+4.64),(193)36.264.78+3.74,(194)7.34+7.57+12.66+6.43,(195)78.6523.1214.88,(195)4.58+2.39+(5.42+7.61),(196)8.27+5.84+1.73+2.16,(197)18.519.080.92,小数加减

14、法-11(198)0.09+0.6+5.91+3.4,(199)7.85+6.76+2.15(200)18.433.767.24(201)21.65+(4.83.65)(202)9.64(4.641.23)(203)2.7+17.6+3.35.6(204)9.873.5+2.138.5(205)5.64+4.97+0.03,(206)10.933.744.26,(207)106.83.2,(208)5.81+8.3+4.19+11.7,(209)3.781.46+1.54,(210)8.45(5.45+2.98);,(211)3.01+8.2+6.99+1.8,(212)4.3(5.985.7

15、),(213)5.520.550.45,(214)19.626.72+80.43.28,(215)27.510.80.2,(216)43.5+1813.5,(217)63.5(43.5+20),小数加减法-12(218)75.3624.9+24.6425.1,(219)12.566.643.36,(220)45.5(0.98+5.5),(221)6+7.94+6.4,(222)5.41+3.462.46,(223)2.030.182.82+7.97,(224)104.445.56,(225)32.63+7.896.4,(226)3.97+0.71.32,(227)30(3.8+0.75),(2

16、28)75.6(14.38.3),小数加减法-13 参考答案参考答案:(1)7.4+12.86=20.26;(2)205.674=14.326;(3)141.248.98=92.22;(4)102+4.36=106.36;(5)32.1527.45=4.7;验算:(6)12.9+5.01=17.91;验算:(7)29.46(9.46+3.8),=29.469.463.8,=203.8,=16.2;(8)15.75+0.652.75+3.35,=(15.752.75)+(0.65+3.35),=13+4,=17;(9)65.714.99,=65.71(50.01),=65.715+0.01,=6

17、0.71+0.01,=60.72;(10)12.42+0.48=12.9,(11)0.56+11.534=12.094,(12)4422.13=21.87,(13)9122.035=68.965,(14)52.6+21.237=73.837,(15)9.152.18=6.97 (16)3.851.5+1.32,=2.35+1.32,=3.67;(17)15.4+6.87=22.27 验算:(18)3.56+27.84=31.4 验算:(19)10082.13=17.87 验算:(20)123.5647.9+51.7=127.36 小数加减法-14 验算:(21)2.7+3.1+2.9+3.2,

18、=2.7+(3.1+2.9)+3.2,=2.7+6+3.2,=11.9(22)28.42+19.48=47.9 验算:(23)42.56+3.124=45.684 验算:(24)8130.75=50.25 验算:(25)15.6 十 0.237=15.837 验算:(26)148.225.6224.38=148.2(25.62+24.38),=148.250,=98.2(27)4.520.740.26=4.52(0.74+0.26)=4.521=3.52;(28)0.42+5.4+1.58+2.6=(0.42+1.58)+(5.4+2.6)=2+8=10;(29)5.9+28.6516.57=

19、17.98;(30)57.53.2516.75,=57.5(3.25+16.75),=57.520,=37.5;(31)6.02+3.6+1.98=6.02+1.98+3.6,=8+3.6,=11.6;(32)1.29+3.7+2.71+6.3=(1.29+2.71)+(3.7+6.3),=4+10,=14;(33)3.070.381.62=3.07(0.38+1.62),=3.072,=1.07;(34)3.25+1.790.59+1.75=(3.25+1.75)+(1.790.59),=5+1.2,=6.2;(35)7.5+4.96.1=12.46.1,=6.3;(36)14.8+7.94

20、.8=14.84.8+7.9,=10+7.9=17.9(37)2.608+2.84=5.448,小数加减法-15(38)6.073.869=2.201,(39)1.50.306=1.194,(40)76.8+26.82=103.62,(41)102.0737.257=64.813,(42)48.64+18.6=67.24 (43)54.755.2514.75,=54.75(14.75+5.25),=54.7520,=34.75;(44)4.68+14.79+5.3210.79,=(4.68+5.32)+(14.7910.79),=10+4,=14;(45)48.912.70.3,=48.9(1

21、2.7+0.3),=48.913,=35.9;(46)56.439.7+24.3,=16.7+24.3,=41;(47)3.62.8+3.47.2,=(3.6+13.4)(2.8+7.2),=1710,=7;(48)3.67+18.5+6.33,=(3.67+6.33)+18.5,=10+18.5,=28.5;(49)12017.832.17,=12017.832.17,=120(17.83+2.17),=12020,=100;(50)17.176.83.26.17=(17.176.17)(6.8+3.2),=1110,=1;(51)73.81.6413.85.36=73.813.8(1.64

22、+5.36),=607,=53;(52)6.75(0.9+3.75)=6.753.750.9,=30.9,=2.1;(53)27.385.34+2.624.66 =22.04+2.624.66,=24.664.66,=20;(54)35.724.9(5.72+5.1)=35.72(4.9+5.72+5.1),=35.7215.72,=20;(55)0.730.250.73+0.25 =0.750.750.25+0.25,=00.25+0.25,=00,=0;(56)5.3+0.1+5.30.1 =5.3+5.3+0.10.1,=10.6+0.10.1,=10.70.1,=10.6;(57)12

23、.74.85.2=12.7(4.8+5.2);=12.710,=2.7(58)23.256.753.25=23.25(6.75+3.25),=23.2510,=13.25(59)4.58+2.39+(5.42+7.61)=(4.58+5.42)+(2.39+7.61)=10+10,=20;(60)9.053.863.14,=9.05(3.86+3.14),=9.057,=2.05;(61)209.180.82,=20(9.18+0.82),=2010,=10 小数加减法-16(62)6.53(1.53+2.6),=6.531.532.6,=42.6,=1.4(63)5.521.0740.926

24、,=5.52(1.074+0.926),=5.522,=3.52(64)4.21+1.04+0.79,=4.21+0.79+1.04,=5+1.04,=6.04(65)1.36+4.85+2.64+6.15,=(1.36+2.64)+(4.85+6.15),=4+11,=15;(66)83.712.830.17,=83.7(12.83+0.17),=83.713,=70.7;(67)4.32+5.43+6.68,=4.32+6.68+5.43,=11+5.43,=16.43;(68)17.176.83.2,=17.17(6.8+3.2),=17.1710,=7.17;(69)1+12.7+5.

25、9+17.3=1+(12.7+17.3)+5.9,=1+30+5.9,=36.9;(70)27042.517.5=270(42.5+17.5),=27060,=210;(71)15.68(7.784.32)2.32,=15.687.78+4.322.32,=(15.68+4.32)(7.78+2.32),=2010,=10;(72)0.9+9.9+99.9+999.9,=10.1+100.1+1000.1+10000.1,=(1+10+100+1000)(0.1+0.1+0.1+0.1),=11110.4,=1110.6(73)25.468.231.76,=25.46(8.23+1.76),=

26、25.469.99=15.45;(74)9.4+0.36.4,=(9.46.4)+0.3,=3+0.3,=3.3;(75)15.25+4.72+4.75+5.28,=(15.25+4.75)+(4.72+5.28),=20+10,=30;(76)34.823(4.82+15.2),=34.8234.8215.2,=30.00315.2,=14.803;(77)12.74.85.2,=12.7(4.8+5.2),=12.710,=2.7;(78)3.1+25.78+6.9,=(3.1+6.9)+25.78,=10+25.78,=35.78;(79)73.81.6413.85.36,=(73.81

27、3.8)(1.64+5.36),=607,=53(80)2.15+8.73+1.27+7.85=(2.15+7.85)+(8.73+1.27),=10+10,=20;(81)11.87(8.2+1.87),=11.871.878.2,=108.2,=1.8;(82)5.423.871.13,=5.425,=0.42;(83)4.381.56+0.620.44,=(4.38+0.62)(1.56+0.44),=52,=3;(84)46.715.034.97=46.7(15.03+4.97),=46.720,=26.7;(85)4.52+0.61+1.39+6.48=(4.52+6.48)+(0.

28、61+1.39),=11+2,=13;(86)4.27(1.961.73)小数加减法-17=4.270.23,=4.04;(87)7.27(1.98+0.27),=7.270.271.98,=71.98,=5.02;(88)13.7+8.659.628,=22.359.628,=12.722;(89)12.8(4.38+1.614)=12.85.994=6.806(90)15.17(3.6+4.9),=15.178.5,=6.67;(91)35.6+(12.64.4),=35.6+8.2,=43.8;(92)16.4+3.5+83.6+166.5=(16.4+83.6)+(3.5+166.5)

29、=100+170=270;(93)4.652.551.45,=4.65(2.55+1.45),=4.654,=0.65;(94)1.28+0.86+38.72,=(1.28+38.72)+0.86,=40+0.86,=40.86;(95)25.743.576.43,=25.74(3.57+6.43),=25.7410,=15.74;(96)14.54.685.32,=14.5(4.68+5.32),=14.510,=4.5;(97)0.485+0.64+3.36,=0.485+(0.64+3.36),=0.485+4,=4.485;(98)72.519.3412.66,=72.51(9.34+

30、12.66),=72.5122,=50.51;(99)14.024.5+0.98,=(14.02+0.98)4.5,=154.5,=10.5;(100)5.76+2.43+0.24+10.57,=(5.76+0.24)+(2.43+10.57),=6+13,=19;(101)9.28(3.28+2.55),=9.283.282.55,=62.55,=3.45;(102)9.5+4.856.13,=14.356.13,=8.22;(103)10.751.862.753.16,=(10.752.75)(1.86+3.16),=85.02,=2.98(104)1.3+0.94+0.06+7.7,=(

31、1.3+7.7)+(0.94+0.06),=9+1,=10;(105)4.45+0.63+5.55,=(4.45+5.55)+0.63,=10+0.63,=10.63;(106)45.5(0.98+5.5),=45.50.985.5,=(45.55.5)0.98,=400.98,=40(10.02),=401+0.2,=39.02;(107)0.960.28+0.040.72,=(0.96+0.04)(0.28+0.72),=11,=0(108)12.7+12.5+0.5,=12.7+(12.5+0.5),=12.7+13,=25.7(109)0.6+0.940.208,=1.540.208,

32、=1.332;(110)27.73(4.731.85),=27.734.73+1.85,=23+1.85,=24.85;(111)3.84+26.5(208.6),=3.84+26.511.4,=3.84+15.1,小数加减法-18=18.94(112)7.385.14+3.622.86,=(7.38+3.62)(5.14+2.86),=118,=3;(113)5.86+13.089.27,=18.949.27,=9.67;(114)25.4(15.46.4),=25.415.4+6.4,=10+6.4,=16.4;(115)47.237.235.89,=405.89,=34.11(116)4

33、.45+0.63+5.55,=4.45+5.55+0.63,=10+0.63,=10.63;(117)5.28(2.9+1.28),=5.281.282.9,=42.9,=1.1;(118)5.25+7.862.86+4.75,=(5.25+4.75)+(7.862.86),=10+5,=15;(119)0.960.28+0.040.72,=(0.96+0.04)(0.28+0.72),=11,=0(120)9.42+7.39+1.58,=(9.42+1.58)+7.39,=11+7.39,=18.39;(121)18.41.65.4,=18.4(1.6+5.4),=18.47,=11.4(1

34、22)75.7+39.423.86,=115.123.86,=91.24;(123)21.21+38.389.79,=59.599.79,=49.8;(124)47.28+1.39+52.72,=47.28+52.72+1.39,=100+1.39,=101.39;(125)2.451.68+1.54,=0.77+1.54,=2.31(126)158.131.87,=15(8.13+1.87),=1510,=5;(127)5.14+3.2256.302,=8.3656.302,=2.063;(128)3.95+5.361.95,=3.951.95+5.36,=2+5.36,=7.36;(129

35、)13.67(5.45+3.67),=13.675.453.67,=13.673.675.45,=105.45,=4.55;(130)4.26+5.481.26+4.52,=(4.52+5.48)+(4.261.26),=10+3;=13;(131)14.67+25.91+15.33+4.09,=(14.67+15.33)+(25.91+4.09),=30+30,=60(132)10.75(2.40.86),=10.751.54,=9.21;(133)9.614.38+0.35,=5.23+0.35,=5.58;(134)3.87+4.92+1.13,=(3.87+1.13)+4.92,=5+

36、4.92,=9.92;(135)46.248.661.34,=46.24(8.66+1.34),=46.2410,=36.24;(136)21.99.220.78+8.1,=21.9(9.22+0.78)+8.1,=21.910+8.1,=11.9+8.1,=20;(137)35.47+39.8812.37,=(35.4712.37)+39.88,=23.1+39.88,小数加减法-19=62.98;(138)93.215.9914.01,=93.21(5.99+14.01),=93.2120,=73.21;(139)15.37+28.94+4.63+1.06,=(15.37+4.63)+(2

37、8.94+1.06),=20+30,=50;(140)42.37(12.379.78),=42.3712.37+9.78,=30+9.78,=39.78(141)38.7819.59+41.2230.41,=38.78+41.2219.5930.41,=(38.78+41.22)(19.59+30.41),=8050,=30;(142)1.9+19.9+199.9+0.3=1.9+19.9+199.9+0.1+0.1+0.1,=(1.9+0.1)+(19.9+0.1)+(199.9+0.1),=2+20+200,=222;(143)429+31.1+2.04,=429+(31.1+2.04),

38、=429+33.14,=462.14,(144)10027.242.8,=100(27.2+42.8),=10070,=30,(145)9(3.02+1.25),=94.27,=4.73,(146)1.81.57+0.2,=1.8+0.21.57,=21.57,=0.43(147)5.032.5+0.96,=2.53+0.96,=3.49;(148)35.72(5.9+5.72),=35.725.95.72,=35.725.725.9,=305.9,=24.1;(149)254.7+5.3,=20.3+5.3,=25.6;(150)1.3+2.83+8.7+0.17,=(1.3+8.7)+(2

39、.83+0.17),=10+3,=13;(151)2.472.23.8+7.53,=(2.47+7.53)(2.2+2.8),=105,=5(152)6.89+4.7+2.11+5.3,=(6.89+2.11)+(4.7+5.3),=9+10,=19;(153)7.462.371.63,=7.46(2.37+1.63),=7.464,=3.46;(154)14(3.65+0.24),=143.89,=10.11;(155)70.81.251.75,=70.8(1.25+1.75),=70.83,=67.8;(156)5.81+8.3+4.19+11.7,=(5.81+4.19)+(8.3+11

40、.7),=10+20,=30;(157)4.2+7.64+5.8+2.36,=(4.2+5.8)+(7.64+2.36),=10+10,=20;(158)14.282.637.37,=14.28(2.63+7.37),=14.2810,=4.28;(159)6.8+5.26+3.74+3.2,=(6.8+3.2)+(5.26+3.74),=10+9,=19;(160)6.213.8+2.2,=2.41+2.2,=4.61;(161)6.03+3.7+2.97,=(6.03+2.97)+3.7,=9+3.7,=12.7;(162)17.436.572.43,=17.43(6.57+2.43),小

41、数加减法-20=17.439,=8.43;(163)20.47(1.47+6.8),=20.471.476.8,=196.8,=12.2;(164)13.26+4.71+3.47+5.29,=(13.26+3.47)+(4.71+5.29),=16.73+10,=26.73;(165)22.74+8.6813.74,=(22.7413.74)+8.68,=9+8.68,=17.68(166)12.566.643.36,=12.56(6.64+3.36),=12.5610,=2.56;(167)45.5(0.98+5.5),=45.50.985.5,=45.55.50.98,=400.98,=3

42、9.02;(168)13.6+7.94+6.4,=(13.6+6.4)+7.94,=20+7.94,=27.94;(169)15.19+3.36+4.64+4.81,=(15.19+4.81)+(3.36+4.64),=20+8,=28(170)4.7+7.69+5.3+2.31,=(4.7+5.3)+(7.69+2.31),=10+10,=20(171)53.7813.637.4+6.22,=(53.78+6.22)(13.6+37.4),=6051,=9(172)60(21.58.8)+7.3,=6012.7+7.3,=47.3+7.3,=54.6(173)9.5+4.856.13,=14

43、.356.13,=8.22;(174)75.8(15.34.8),=75.810.5,=65.3;(175)51.278.661.34,=51.27(8.66+1.34),=51.2710,=41.27;(176)28.43.961.04+4.6,=(28.4+4.6)(3.96+1.04),=335,=28;(177)70.87.251.75=70.8(7.25+1.75),=70.89,=61.8;(178)5.81+8.3+4.19+11.7=(5.81+4.19)+(8.3+1.7),=10+10,=20;(179)794198,=794(2002),=794200+2,=594+2,

44、=596;(180)6756193207,=6756(193+207),=6756400,=6356;(181)0.9+1.08+0.92+0.1,=(0.9+0.1)+(1.08+0.92),=1+2,=3;(182)13.596.910.09,=13.59(6.91+0.09),=13.597,=6.59(183)4.58+3.38+(5.48+6.62)=4.58+5.48+(3.38+6.62),=10.06+10,=20.06;(184)73.75(4.3+8.75)=73.758.754.3,=654.3,=60.7;(185)5(4.192.83),=51.36,=3.64;(1

45、86)1.39+0.72+0.61+3.28,=(1.39+0.61)+(0.72+3.28),=2+4,=6;(187)83.76.3,小数加减法-21=8(3.7+6.3),=810,=2;(188)8.28(1.28+3.7),=8.281.283.7,=73.7,=3.3(189)15.377.59+5.7312.41,=(15.37+5.73)(7.59+12.41),=2120,=1;(190)11.727.85(1.26+0.46),=11.727.851.72,=11.721.727.85,=107.85,=2.15(191)15.37+28.44+12.56,=15.37+(

46、28.44+12.56),=15.37+41,=56.37;(192)12.64(3.96+4.64),=12.643.964.64,=12.644.643.96,=83.96,=4.04;(193)36.264.78+3.74,=36.26+3.744.78,=404.78,=35.22;(194)7.34+7.57+12.66+6.43,=(7.34+12.66)+(7.57+6.43),=20+14,=34;(195)78.6523.1214.88,=78.65(23.12+14.88),=78.6538,=40.65(195)4.58+2.39+(5.42+7.61),=(4.58+5

47、.42)+(2.39+7.61),=10+10,=20(196)8.27+5.84+1.73+2.16,=(8.27+1.73)+(5.84+2.16),=10+8,=18(197)18.519.080.92,=18.51(9.08+0.92),=18.5110,=8.51(198)0.09+0.6+5.91+3.4,=(0.09+5.91)+(0.6+3.4),=6+4,=10(199)7.85+6.76+2.15=7.85+2.15+6.76,=10+6.76,=16.76;(200)18.433.767.24=18.43(3.76+7.24),=18.4311,=7.43;(201)21

48、.65+(4.83.65)=21.653.65+4.8,=18+4.8,=22.8;(202)9.64(4.641.23)=9.644.64+1.23,=5+1.23,=6.23;(203)2.7+17.6+3.35.6=2.7+3.3+(17.65.6),=6+12,=18;(204)9.873.5+2.138.5=9.87+2.13(3.5+8.5),=1212,=0(205)5.64+4.97+0.03,=5.64+(4.97+0.03),=5.64+5,=10.64;(206)10.933.744.26,=10.93(3.74+4.26),=10.938,=2.93;(207)106.

49、83.2,=10(6.8+3.2)=1010,=0;(208)5.81+8.3+4.19+11.7,=(5.81+4.19)+(8.3+11.7),=10+20,=30;(209)3.781.46+1.54,=2.14+1.54,=3.68(210)8.45(5.45+2.98);,=8.455.452.98,小数加减法-22=(8.455.45)(30.02),=33+0.02,=0.02;(211)3.01+8.2+6.99+1.8,=(3.01+6.99)+(8.2+1.8),=10+10,=20;(212)4.3(5.985.7),=4.35.98+5.7,=(4.3+5.7)(60.

50、02),=106+0.02,=4+0.02,=4.02;(213)5.520.550.45,=5.52(0.55+0.45),=5.521,=4.52(214)19.626.72+80.43.28,=(19.6+80.4)3.2826.72,=(19.6+80.4)(3.28+26.72),=10030,=70;(215)27.510.80.2,=27.5(10.8+0.2),=27.511,=16.5;(216)43.5+1813.5,=43.513.5+18,=30+18,=48;(217)63.5(43.5+20),=63.543.520,=2020,=0;(218)75.3624.9+

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