(233)小数加减法专项练习200题(有答案)ok

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小数加减法专项练习200题(有答案)

(1)7.4+12.86

(2)20﹣5.674 (3)141.2﹣48.98

(4)102+4.36 (5)32.15﹣27.45 (6)12.9+5.01 (7)29.46﹣(9.46+3.8) (8)15.75+0.65﹣2.75+3.35 (9)65.71﹣4.99 (10)12.42+0.48

(11)0.56+11.534

(12)44﹣22.13

(13)91﹣22.035

(14)52.6+21.237

(15)9.15﹣2.18

(16)3.85﹣1.5+1.32,

(17)15.4+6.87

(18)3.56+27.84

小数加减法--- 第 1 页 共 1 页

(19)100﹣82.13=17.87 (20)123.56﹣47.9+51.7 (21)2.7+3.1+2.9+3.2, (22)28.42+19.48 (23)42.56+3.124 (24)81﹣30.75 (25)15.6十0.237 (26)148.2﹣25.62﹣24.38 (27)4.52﹣0.74﹣0.26 (28)0.42+5.4+1.58+2.6 (29)5.9+28.65﹣16.57

(30)57.5﹣3.25﹣16.75,

(31)6.02+3.6+1.98

(32)1.29+3.7+2.71+6.3

(33)3.07﹣0.38﹣1.62

(34)3.25+1.79﹣0.59+1.75

(35)7.5+4.9﹣6.1

(36)14.8+7.9﹣4.8

(37)2.608+2.84

(38)6.07﹣3.869

小数加减法-- 第 2 页 共 2 页

(39)1.5﹣0.306 (40)76.8+26.82 (41)102.07﹣37.257 (42)48.64+18.6 (43)54.75﹣5.25﹣14.75, (44)4.68+14.79+5.32﹣10.79,(45)48.9﹣12.7﹣0.3, (46)56.4﹣39.7+24.3, (47)3.6﹣2.8+3.4﹣7.2, (48)3.67+18.5+6.33, (49)120﹣17.83﹣2.17,

(50)17.17﹣6.8﹣3.2﹣6.17

(51)73.8﹣1.64﹣13.8﹣5.36

(52)6.75﹣(0.9+3.75)

(53)27.38﹣5.34+2.62﹣4.66

(54)35.72﹣4.9﹣(5.72+5.1)

(55)0.73﹣0.25﹣0.73+0.25

(56)5.3+0.1+5.3﹣0.1

(57)12.7﹣4.8﹣5.2.

(58)23.25﹣6.75﹣3.25

小数加减法-- 第 3 页 共 3 页

(59)4.58+2.39+(5.42+7.61) (60)9.05﹣3.86﹣3.14 (61)20﹣9.18﹣0.82 (62)6.53﹣(1.53+2.6) (63)5.52﹣1.074﹣0.926 (64)4.21+1.04+0.79 (65)1.36+4.85+2.64+6.15 (66)83.7﹣12.83﹣0.17 (67)4.32+5.43+6.68 (68)17.17﹣6.8﹣3.2, (69)1+12.7+5.9+17.3

(70)270﹣42.5﹣17.5

(71)15.68﹣(7.78﹣4.32)﹣2.32,

(72)0.9+9.9+99.9+999.9,

(73)25.46﹣8.23﹣1.76,

(74)9.4+0.3﹣6.4,

(75)15.25+4.72+4.75+5.28,

(76)34.823﹣(4.82+15.2),

(77)12.7﹣4.8﹣5.2,

(78)3.1+25.78+6.9,

小数加减法-- 第 4 页 共 4 页

(79)73.8﹣1.64﹣13.8﹣5.36, (80)2.15+8.73+1.27+7.85 (81)11.87﹣(8.2+1.87), (82)5.42﹣3.87﹣1.13, (83)4.38﹣1.56+0.62﹣0.44, (84)46.7﹣15.03﹣4.97 (85)4.52+0.61+1.39+6.48 (86)4.27﹣(1.96﹣1.73) (87)7.27﹣(1.98+0.27), (88)13.7+8.65﹣9.628, (89)12.8﹣(4.38+1.614)

(90)15.17﹣(3.6+4.9),

(91)35.6+(12.6﹣4.4),

(92)16.4+3.5+83.6+166.5

(93)4.65﹣2.55﹣1.45,

(94)1.28+0.86+38.72,

(95)25.74﹣3.57﹣6.43,

(96)14.5﹣4.68﹣5.32,

(97)0.485+0.64+3.36,

(98)72.51﹣9.34﹣12.66,

小数加减法-- 第 5 页 共 5 页

(99)14.02﹣4.5+0.98, (100)5.76+2.43+0.24+10.57, (101)9.28﹣(3.28+2.55), (102)9.5+4.85﹣6.13, (103)10.75﹣1.86﹣2.75﹣3.16,(104)1.3+0.94+0.06+7.7, (105)4.45+0.63+5.55, (106)45.5﹣(0.98+5.5), (107)0.96﹣0.28+0.04﹣0.72, (108)12.7+12.5+0.5, (109)0.6+0.94﹣0.208,

(110)27.73﹣(4.73﹣1.85),

(111)3.84+[26.5﹣(20﹣8.6)],

(112)7.38﹣5.14+3.62﹣2.86,

(113)5.86+13.08﹣9.27,

(114)25.4﹣(15.4﹣6.4),

(115)47.23﹣7.23﹣5.89,

(116)4.45+0.63+5.55,

(117)5.28﹣(2.9+1.28),

(118)5.25+7.86﹣2.86+4.75,

小数加减法-- 第 6 页 共 6 页

(119)0.96﹣0.28+0.04﹣0.72, (120)9.42+7.39+1.58, (121)18.4﹣1.6﹣5.4, (122)75.7+39.4﹣23.86, (123)21.21+38.38﹣9.79, (124)47.28+1.39+52.72, (125)2.45﹣1.68+1.54, (126)15﹣8.13﹣1.87, (127)5.14+3.225﹣6.302, (128)3.95+5.36﹣1.95, (129)13.67﹣(5.45+3.67),

(130)4.26+5.48﹣1.26+4.52,

(131)14.67+25.91+15.33+4.09,

(132)10.75﹣(2.4﹣0.86),

(133)9.61﹣4.38+0.35,

(134)3.87+4.92+1.13,

(135)46.24﹣8.66﹣1.34,

(136)21.9﹣9.22﹣0.78+8.1,

(137)35.47+39.88﹣12.37,

(138)93.21﹣5.99﹣14.01,

小数加减法-- 第 7 页 共 7 页

(139)15.37+28.94+4.63+1.06, (140)42.37﹣(12.37﹣9.78), (141)38.78﹣19.59+41.22﹣30.41,(142)1.9+19.9+199.9+0.3 (143)429+31.1+2.04, (144)100﹣27.2﹣42.8, (145)9﹣(3.02+1.25), (146)1.8﹣1.57+0.2, (147)5.03﹣2.5+0.96, (148)35.72﹣(5.9+5.72), (149)25﹣4.7+5.3,

(150)1.3+2.83+8.7+0.17,

(151)2.47﹣2.2﹣3.8+7.53,

(152)6.89+4.7+2.11+5.3,

(153)7.46﹣2.37﹣1.63,

(154)14﹣(3.65+0.24),

(155)70.8﹣1.25﹣1.75,

(156)5.81+8.3+4.19+11.7,

(157)4.2+7.64+5.8+2.36,

(158)14.28﹣2.63﹣7.37,

小数加减法-- 第 8 页 共 8 页

(159)6.8+5.26+3.74+3.2, (160)6.21﹣3.8+2.2, (161)6.03+3.7+2.97, (162)17.43﹣6.57﹣2.43, (163)20.47﹣(1.47+6.8), (164)13.26+4.71+3.47+5.29,(165)22.74+8.68﹣13.74, (166)12.56﹣6.64﹣3.36, (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,

(171)53.78﹣13.6﹣37.4+6.22,

(172)60﹣(21.5﹣8.8)+7.3,

(173)9.5+4.85﹣6.13,

(174)75.8﹣(15.3﹣4.8),

(175)51.27﹣8.66﹣1.34,

(176)28.4﹣3.96﹣1.04+4.6,

(177)70.8﹣7.25﹣1.75

(178)5.81+8.3+4.19+11.7

小数加减法-- 第 9 页 共 9 页

(179)794﹣198, (180)6756﹣193﹣207, (181)0.9+1.08+0.92+0.1, (182)13.59﹣6.91﹣0.09, (183)4.58+3.38+(5.48+6.62)(184)73.75﹣(4.3+8.75) (185)5﹣(4.19﹣2.83), (186)1.39+0.72+0.61+3.28, (187)8﹣3.7﹣6.3, (188)8.28﹣(1.28+3.7), (189)15.37﹣7.59+5.73﹣12.41,

(190)11.72﹣7.85﹣(1.26+0.46),

(191)15.37+28.44+12.56,

(192)12.64﹣(3.96+4.64),

(193)36.26﹣4.78+3.74,

(194)7.34+7.57+12.66+6.43,

(195)78.65﹣23.12﹣14.88,

(195)4.58+2.39+(5.42+7.61),

(196)8.27+5.84+1.73+2.16,

(197)18.51﹣9.08﹣0.92,.

小数加减法--第 10 页 共 10 页

(198)0.09+0.6+5.91+3.4, (199)7.85+6.76+2.15 (200)18.43﹣3.76﹣7.24 (201)21.65+(4.8﹣3.65) (202)9.64﹣(4.64﹣1.23) (203)2.7+17.6+3.3﹣5.6 (204)9.87﹣3.5+2.13﹣8.5 (205)5.64+4.97+0.03, (206)10.93﹣3.74﹣4.26, (207)10﹣6.8﹣3.2, (208)5.81+8.3+4.19+11.7,

(209)3.78﹣1.46+1.54,

(210)8.45﹣(5.45+2.98);,

(211)3.01+8.2+6.99+1.8,

(212)4.3﹣(5.98﹣5.7),

(213)5.52﹣0.55﹣0.45,

(214)19.6﹣26.72+80.4﹣3.28,

(215)27.5﹣10.8﹣0.2,

(216)43.5+18﹣13.5,

(217)63.5﹣(43.5+20),

小数加减法--第 11 页 共 11 页

(218)75.36﹣24.9+24.64﹣25.1, (219)12.56﹣6.64﹣3.36, (220)45.5﹣(0.98+5.5), (221)6+7.94+6.4, (222)5.41+3.46﹣2.46, (223)2.03﹣0.18﹣2.82+7.97,

(224)10﹣4.44﹣5.56,

(225)32.63+7.89﹣6.4,

(226)3.97+0.7﹣1.32,

(227)30﹣(3.8+0.75),

(228)75.6﹣(14.3﹣8.3),

小数加减法--第 12 页 共 12 页

小数加减法200题参考答案:

(1)7.4+12.86=20.26;

(2)20﹣5.674=14.326;

(3)141.2﹣48.98=92.22;

(4)102+4.36=106.36;

(5)32.15﹣27.45=4.7;

验算:

(6)12.9+5.01=17.91;

验算:

(7)29.46﹣(9.46+3.8), =29.46﹣9.46﹣3.8, =20﹣3.8, =16.2;

(8)15.75+0.65﹣2.75+3.35, =(15.75﹣2.75)+(0.65+3.35), =13+4, =17;

(9)65.71﹣4.99, =65.71﹣(5﹣0.01), =65.71﹣5+0.01,

=60.71+0.01, =60.72;

(10)12.42+0.48=12.9, (11)0.56+11.534=12.094, (12)44﹣22.13=21.87,

(13)91﹣22.035=68.965,

(14)52.6+21.237=73.837,

(15)9.15﹣2.18=6.97.

(16)3.85﹣1.5+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)100﹣82.13=17.87

验算:

(20)123.56﹣47.9+51.7=127.36

小数加减法--第 13 页 共 13 页

验算:

(21)2.7+3.1+2.9+3.2, =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)81﹣30.75=50.25

验算:

(25)15.6十0.237=15.837

验算:

(26)148.2﹣25.62﹣24.38 =148.2﹣(25.62+24.38),

=148.2﹣50, =98.2.

(27)4.52﹣0.74﹣0.26 =4.52﹣(0.74+0.26) =4.52﹣1 =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+28.65﹣16.57=17.98;

(30)57.5﹣3.25﹣16.75, =57.5﹣(3.25+16.75), =57.5﹣20, =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)3.07﹣0.38﹣1.62 =3.07﹣(0.38+1.62), =3.07﹣2, =1.07;

(34)3.25+1.79﹣0.59+1.75 =(3.25+1.75)+(1.79﹣0.59), =5+1.2, =6.2;

(35)7.5+4.9﹣6.1 =12.4﹣6.1, =6.3;

(36)14.8+7.9﹣4.8 =14.8﹣4.8+7.9, =10+7.9 =17.9

(37)2.608+2.84=5.448,

小数加减法--第 14 页 共 14 页

(38)6.07﹣3.869=2.201,

(39)1.5﹣0.306=1.194,

(40)76.8+26.82=103.62,

(41)102.07﹣37.257=64.813,

(42)48.64+18.6=67.24.

(43)54.75﹣5.25﹣14.75, =54.75﹣(14.75+5.25), =54.75﹣20, =34.75;

(44)4.68+14.79+5.32﹣10.79, =(4.68+5.32)+(14.79﹣10.79),=10+4,

=14; (45)48.9﹣12.7﹣0.3, =48.9﹣(12.7+0.3), =48.9﹣13, =35.9;

(46)56.4﹣39.7+24.3, =16.7+24.3, =41;

(47)3.6﹣2.8+3.4﹣7.2, =(3.6+13.4)﹣(2.8+7.2), =17﹣10, =7;

(48)3.67+18.5+6.33, =(3.67+6.33)+18.5, =10+18.5, =28.5;

(49)120﹣17.83﹣2.17, =120﹣17.83﹣2.17, =120﹣(17.83+2.17), =120﹣20, =100;

(50)17.17﹣6.8﹣3.2﹣6.17 =(17.17﹣6.17)﹣(6.8+3.2), =11﹣10, =1;

(51)73.8﹣1.64﹣13.8﹣5.36 =73.8﹣13.8﹣(1.64+5.36), =60﹣7, =53;

(52)6.75﹣(0.9+3.75) =6.75﹣3.75﹣0.9, =3﹣0.9, =2.1;

(53)27.38﹣5.34+2.62﹣4.66 =22.04+2.62﹣4.66, =24.66﹣4.66, =20;

(54)35.72﹣4.9﹣(5.72+5.1) =35.72﹣(4.9+5.72+5.1), =35.72﹣15.72, =20;

(55)0.73﹣0.25﹣0.73+0.25 =0.75﹣0.75﹣0.25+0.25, =0﹣0.25+0.25, =0﹣0, =0;

(56)5.3+0.1+5.3﹣0.1 =5.3+5.3+0.1﹣0.1, =10.6+0.1﹣0.1, =10.7﹣0.1, =10.6;

(57)12.7﹣4.8﹣5.2. =12.7﹣(4.8+5.2); =12.7﹣10, =2.7.

(58)23.25﹣6.75﹣3.25 =23.25﹣(6.75+3.25), =23.25﹣10, =13.25.

(59)4.58+2.39+(5.42+7.61) =(4.58+5.42)+(2.39+7.61) =10+10, =20;

(60)9.05﹣3.86﹣3.14, =9.05﹣(3.86+3.14), =9.05﹣7, =2.05;

(61)20﹣9.18﹣0.82, =20﹣(9.18+0.82), =20﹣10, =10.

小数加减法--第 15 页 共 15 页

(62)6.53﹣(1.53+2.6), =6.53﹣1.53﹣2.6, =4﹣2.6, =1.4.

(63)5.52﹣1.074﹣0.926, =5.52﹣(1.074+0.926), =5.52﹣2, =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)83.7﹣12.83﹣0.17, =83.7﹣(12.83+0.17), =83.7﹣13, =70.7;

(67)4.32+5.43+6.68, =4.32+6.68+5.43, =11+5.43, =16.43;

(68)17.17﹣6.8﹣3.2, =17.17﹣(6.8+3.2), =17.17﹣10, =7.17;

(69)1+12.7+5.9+17.3 =1+(12.7+17.3)+5.9, =1+30+5.9, =36.9;

(70)270﹣42.5﹣17.5 =270﹣(42.5+17.5), =270﹣60, =210;

(71)15.68﹣(7.78﹣4.32)﹣2.32, =15.68﹣7.78+4.32﹣2.32,

=(15.68+4.32)﹣(7.78+2.32), =20﹣10, =10;

(72)0.9+9.9+99.9+999.9,

=1﹣0.1+10﹣0.1+100﹣0.1+1000﹣0.1, =(1+10+100+1000)﹣(0.1+0.1+0.1+0.1),=1111﹣0.4, =1110.6

(73)25.46﹣8.23﹣1.76, =25.46﹣(8.23+1.76), =25.46﹣9.99 =15.45;

(74)9.4+0.3﹣6.4, =(9.4﹣6.4)+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), =34.823﹣4.82﹣15.2, =30.003﹣15.2, =14.803;

(77)12.7﹣4.8﹣5.2, =12.7﹣(4.8+5.2), =12.7﹣10, =2.7;

(78)3.1+25.78+6.9, =(3.1+6.9)+25.78, =10+25.78, =35.78;

(79)73.8﹣1.64﹣13.8﹣5.36, =(73.8﹣13.8)﹣(1.64+5.36), =60﹣7, =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), =11.87﹣1.87﹣8.2, =10﹣8.2, =1.8;

(82)5.42﹣3.87﹣1.13, =5.42﹣5, =0.42;

(83)4.38﹣1.56+0.62﹣0.44, =(4.38+0.62)﹣(1.56+0.44), =5﹣2, =3;

(84)46.7﹣15.03﹣4.97 =46.7﹣(15.03+4.97), =46.7﹣20, =26.7;

(85)4.52+0.61+1.39+6.48 =(4.52+6.48)+(0.61+1.39), =11+2, =13;

(86)4.27﹣(1.96﹣1.73)

小数加减法--第 16 页 共 16 页

=4.27﹣0.23, =4.04;

(87)7.27﹣(1.98+0.27), =7.27﹣0.27﹣1.98, =7﹣1.98, =5.02;

(88)13.7+8.65﹣9.628, =22.35﹣9.628, =12.722;

(89)12.8﹣(4.38+1.614) =12.8﹣5.994 =6.806

(90)15.17﹣(3.6+4.9), =15.17﹣8.5, =6.67;

(91)35.6+(12.6﹣4.4), =35.6+8.2, =43.8;

(92)16.4+3.5+83.6+166.5 =(16.4+83.6)+(3.5+166.5)=100+170 =270;

(93)4.65﹣2.55﹣1.45, =4.65﹣(2.55+1.45), =4.65﹣4, =0.65;

(94)1.28+0.86+38.72, =(1.28+38.72)+0.86, =40+0.86, =40.86;

(95)25.74﹣3.57﹣6.43, =25.74﹣(3.57+6.43), =25.74﹣10, =15.74;

(96)14.5﹣4.68﹣5.32, =14.5﹣(4.68+5.32), =14.5﹣10, =4.5;

(97)0.485+0.64+3.36, =0.485+(0.64+3.36), =0.485+4, =4.485;

(98)72.51﹣9.34﹣12.66, =72.51﹣(9.34+12.66), =72.51﹣22, =50.51;

(99)14.02﹣4.5+0.98, =(14.02+0.98)﹣4.5, =15﹣4.5, =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), =9.28﹣3.28﹣2.55, =6﹣2.55, =3.45;

(102)9.5+4.85﹣6.13, =14.35﹣6.13, =8.22;

(103)10.75﹣1.86﹣2.75﹣3.16, =(10.75﹣2.75)﹣(1.86+3.16), =8﹣5.02, =2.98

(104)1.3+0.94+0.06+7.7, =(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), =45.5﹣0.98﹣5.5, =(45.5﹣5.5)﹣0.98, =40﹣0.98, =40﹣(1﹣0.02), =40﹣1+0.2, =39.02;

(107)0.96﹣0.28+0.04﹣0.72, =(0.96+0.04)﹣(0.28+0.72), =1﹣1, =0.

(108)12.7+12.5+0.5, =12.7+(12.5+0.5), =12.7+13, =25.7

(109)0.6+0.94﹣0.208, =1.54﹣0.208, =1.332;

(110)27.73﹣(4.73﹣1.85), =27.73﹣4.73+1.85, =23+1.85, =24.85;

(111)3.84+[26.5﹣(20﹣8.6)], =3.84+[26.5﹣11.4], =3.84+15.1,

小数加减法--第 17 页 共 17 页

=18.94

(112)7.38﹣5.14+3.62﹣2.86, =(7.38+3.62)﹣(5.14+2.86), =11﹣8, =3;

(113)5.86+13.08﹣9.27, =18.94﹣9.27, =9.67;

(114)25.4﹣(15.4﹣6.4), =25.4﹣15.4+6.4, =10+6.4, =16.4;

(115)47.23﹣7.23﹣5.89, =40﹣5.89, =34.11.

(116)4.45+0.63+5.55, =4.45+5.55+0.63, =10+0.63, =10.63;

(117)5.28﹣(2.9+1.28), =5.28﹣1.28﹣2.9, =4﹣2.9, =1.1;

(118)5.25+7.86﹣2.86+4.75, =(5.25+4.75)+(7.86﹣2.86), =10+5, =15;

(119)0.96﹣0.28+0.04﹣0.72, =(0.96+0.04)﹣(0.28+0.72), =1﹣1, =0.

(120)9.42+7.39+1.58, =(9.42+1.58)+7.39, =11+7.39, =18.39;

(121)18.4﹣1.6﹣5.4, =18.4﹣(1.6+5.4), =18.4﹣7, =11.4

(122)75.7+39.4﹣23.86, =115.1﹣23.86, =91.24;

(123)21.21+38.38﹣9.79, =59.59﹣9.79, =49.8;

(124)47.28+1.39+52.72, =47.28+52.72+1.39, =100+1.39, =101.39; (125)2.45﹣1.68+1.54, =0.77+1.54, =2.31

(126)15﹣8.13﹣1.87, =15﹣(8.13+1.87), =15﹣10, =5;

(127)5.14+3.225﹣6.302, =8.365﹣6.302, =2.063;

(128)3.95+5.36﹣1.95, =3.95﹣1.95+5.36, =2+5.36, =7.36;

(129)13.67﹣(5.45+3.67), =13.67﹣5.45﹣3.67, =13.67﹣3.67﹣5.45, =10﹣5.45, =4.55;

(130)4.26+5.48﹣1.26+4.52, =(4.52+5.48)+(4.26﹣1.26), =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﹣(2.4﹣0.86), =10.75﹣1.54, =9.21;

(133)9.61﹣4.38+0.35, =5.23+0.35, =5.58;

(134)3.87+4.92+1.13, =(3.87+1.13)+4.92, =5+4.92, =9.92;

(135)46.24﹣8.66﹣1.34, =46.24﹣(8.66+1.34), =46.24﹣10, =36.24;

(136)21.9﹣9.22﹣0.78+8.1, =21.9﹣(9.22+0.78)+8.1, =21.9﹣10+8.1, =11.9+8.1, =20;

(137)35.47+39.88﹣12.37, =(35.47﹣12.37)+39.88, =23.1+39.88,

小数加减法--第 18 页 共 18 页

=62.98;

(138)93.21﹣5.99﹣14.01, =93.21﹣(5.99+14.01), =93.21﹣20, =73.21;

(139)15.37+28.94+4.63+1.06, =(15.37+4.63)+(28.94+1.06), =20+30, =50;

(140)42.37﹣(12.37﹣9.78), =42.37﹣12.37+9.78, =30+9.78, =39.78

(141)38.78﹣19.59+41.22﹣30.41, =38.78+41.22﹣19.59﹣30.41, =(38.78+41.22)﹣(19.59+30.41), =80﹣50, =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), =429+33.14, =462.14,

(144)100﹣27.2﹣42.8, =100﹣(27.2+42.8), =100﹣70, =30,

(145)9﹣(3.02+1.25), =9﹣4.27, =4.73,

(146)1.8﹣1.57+0.2, =1.8+0.2﹣1.57, =2﹣1.57, =0.43

(147)5.03﹣2.5+0.96, =2.53+0.96, =3.49;

(148)35.72﹣(5.9+5.72), =35.72﹣5.9﹣5.72, =35.72﹣5.72﹣5.9, =30﹣5.9, =24.1;

(149)25﹣4.7+5.3, =20.3+5.3, =25.6; (150)1.3+2.83+8.7+0.17, =(1.3+8.7)+(2.83+0.17), =10+3, =13;

(151)2.47﹣2.2﹣3.8+7.53, =(2.47+7.53)﹣(2.2+2.8), =10﹣5, =5

(152)6.89+4.7+2.11+5.3, =(6.89+2.11)+(4.7+5.3), =9+10, =19;

(153)7.46﹣2.37﹣1.63, =7.46﹣(2.37+1.63), =7.46﹣4, =3.46;

(154)14﹣(3.65+0.24), =14﹣3.89, =10.11;

(155)70.8﹣1.25﹣1.75, =70.8﹣(1.25+1.75), =70.8﹣3, =67.8;

(156)5.81+8.3+4.19+11.7, =(5.81+4.19)+(8.3+11.7), =10+20, =30;

(157)4.2+7.64+5.8+2.36, =(4.2+5.8)+(7.64+2.36), =10+10, =20;

(158)14.28﹣2.63﹣7.37, =14.28﹣(2.63+7.37), =14.28﹣10, =4.28;

(159)6.8+5.26+3.74+3.2, =(6.8+3.2)+(5.26+3.74), =10+9, =19;

(160)6.21﹣3.8+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)17.43﹣6.57﹣2.43, =17.43﹣(6.57+2.43),

小数加减法--第 19 页 共 19 页

=17.43﹣9, =8.43;

(163)20.47﹣(1.47+6.8), =20.47﹣1.47﹣6.8, =19﹣6.8, =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+8.68﹣13.74, =(22.74﹣13.74)+8.68, =9+8.68, =17.68

(166)12.56﹣6.64﹣3.36, =12.56﹣(6.64+3.36), =12.56﹣10, =2.56;

(167)45.5﹣(0.98+5.5), =45.5﹣0.98﹣5.5, =45.5﹣5.5﹣0.98, =40﹣0.98, =39.02;

(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)53.78﹣13.6﹣37.4+6.22, =(53.78+6.22)﹣(13.6+37.4), =60﹣51, =9.

(172)60﹣(21.5﹣8.8)+7.3, =60﹣12.7+7.3, =47.3+7.3, =54.6

(173)9.5+4.85﹣6.13, =14.35﹣6.13, =8.22;

(174)75.8﹣(15.3﹣4.8), =75.8﹣10.5, =65.3; (175)51.27﹣8.66﹣1.34, =51.27﹣(8.66+1.34), =51.27﹣10, =41.27;

(176)28.4﹣3.96﹣1.04+4.6, =(28.4+4.6)﹣(3.96+1.04), =33﹣5, =28;

(177)70.8﹣7.25﹣1.75 =70.8﹣(7.25+1.75), =70.8﹣9, =61.8;

(178)5.81+8.3+4.19+11.7 =(5.81+4.19)+(8.3+1.7), =10+10, =20;

(179)794﹣198, =794﹣(200﹣2), =794﹣200+2, =594+2, =596;

(180)6756﹣193﹣207, =6756﹣(193+207), =6756﹣400, =6356;

(181)0.9+1.08+0.92+0.1, =(0.9+0.1)+(1.08+0.92), =1+2, =3;

(182)13.59﹣6.91﹣0.09, =13.59﹣(6.91+0.09), =13.59﹣7, =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) =73.75﹣8.75﹣4.3, =65﹣4.3, =60.7;

(185)5﹣(4.19﹣2.83), =5﹣1.36, =3.64;

(186)1.39+0.72+0.61+3.28, =(1.39+0.61)+(0.72+3.28), =2+4, =6;

(187)8﹣3.7﹣6.3,

小数加减法--第 20 页 共 20 页

=8﹣(3.7+6.3), =8﹣10, =﹣2;

(188)8.28﹣(1.28+3.7), =8.28﹣1.28﹣3.7, =7﹣3.7, =3.3

(189)15.37﹣7.59+5.73﹣12.41, =(15.37+5.73)﹣(7.59+12.41), =21﹣20, =1;

(190)11.72﹣7.85﹣(1.26+0.46), =11.72﹣7.85﹣1.72, =11.72﹣1.72﹣7.85, =10﹣7.85, =2.15

(191)15.37+28.44+12.56, =15.37+(28.44+12.56), =15.37+41, =56.37;

(192)12.64﹣(3.96+4.64), =12.64﹣3.96﹣4.64, =12.64﹣4.64﹣3.96, =8﹣3.96, =4.04;

(193)36.26﹣4.78+3.74, =36.26+3.74﹣4.78, =40﹣4.78, =35.22;

(194)7.34+7.57+12.66+6.43, =(7.34+12.66)+(7.57+6.43), =20+14, =34;

(195)78.65﹣23.12﹣14.88, =78.65﹣(23.12+14.88), =78.65﹣38, =40.65

(195)4.58+2.39+(5.42+7.61), =(4.58+5.42)+(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)18.51﹣9.08﹣0.92, =18.51﹣(9.08+0.92), =18.51﹣10, =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)18.43﹣3.76﹣7.24 =18.43﹣(3.76+7.24), =18.43﹣11, =7.43;

(201)21.65+(4.8﹣3.65) =21.65﹣3.65+4.8, =18+4.8, =22.8;

(202)9.64﹣(4.64﹣1.23) =9.64﹣4.64+1.23, =5+1.23, =6.23;

(203)2.7+17.6+3.3﹣5.6 =2.7+3.3+(17.6﹣5.6), =6+12, =18;

(204)9.87﹣3.5+2.13﹣8.5 =9.87+2.13﹣(3.5+8.5), =12﹣12, =0.

(205)5.64+4.97+0.03, =5.64+(4.97+0.03), =5.64+5, =10.64;

(206)10.93﹣3.74﹣4.26, =10.93﹣(3.74+4.26), =10.93﹣8, =2.93;

(207)10﹣6.8﹣3.2, =10﹣﹣(6.8+3.2) =10﹣10, =0;

(208)5.81+8.3+4.19+11.7, =(5.81+4.19)+(8.3+11.7), =10+20, =30;

(209)3.78﹣1.46+1.54, =2.14+1.54, =3.68.

(210)8.45﹣(5.45+2.98);, =8.45﹣5.45﹣2.98,

小数加减法--第 21 页 共 21 页

=(8.45﹣5.45)﹣(3﹣0.02), =3﹣3+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﹣(5.98﹣5.7), =4.3﹣5.98+5.7,

=(4.3+5.7)﹣(6﹣0.02), =10﹣6+0.02, =4+0.02, =4.02;

(213)5.52﹣0.55﹣0.45, =5.52﹣(0.55+0.45), =5.52﹣1, =4.52

(214)19.6﹣26.72+80.4﹣3.28,=(19.6+80.4)﹣3.28﹣26.72, =(19.6+80.4)﹣(3.28+26.72),=100﹣30, =70;

(215)27.5﹣10.8﹣0.2, =27.5﹣(10.8+0.2), =27.5﹣11, =16.5;

(216)43.5+18﹣13.5, =43.5﹣13.5+18, =30+18, =48;

(217)63.5﹣(43.5+20), =63.5﹣43.5﹣20, =20﹣20, =0;

(218)75.36﹣24.9+24.64﹣25.1,=(75.36+24.64)﹣(24.9+25.1),=100﹣50, =50;

(219)12.56﹣6.64﹣3.36, =12.56﹣(6.64+3.36), =12.56﹣10, =2.56;

(220)45.5﹣(0.98+5.5), =45.5﹣6.48, =39.02;

(221)6+7.94+6.4, =13.94+6.4, =20.34;

(222)5.41+3.46﹣2.46,

=5.41+(3.46﹣2.46), =5.41+1, =6.41;

(223)2.03﹣0.18﹣2.82+7.97, =(2.03+7.97)﹣(0.18+2.82), =10﹣3, =7;

(224)10﹣4.44﹣5.56, =10﹣(4.44+5.56), =10﹣10, =0;

(225)32.63+7.89﹣6.4, =40.52﹣6.4, =34.12;

(226)3.97+0.7﹣1.32, =4.67﹣1.32, =3.35;

(227)30﹣(3.8+0.75), =30﹣4.55, =25.45;

(228)75.6﹣(14.3﹣8.3), =75.6﹣6, =69.6;

小数加减法--第 22 页 共 22 页

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