(45)整數(shù)簡便運算120題(有答案過程)

1、(45)整數(shù)簡便運算120題(有答案過程)四年級數(shù)學(xué)整數(shù)簡便運算120道(1)67+42+33+58(10)163X8+37X8(2)2585826-74(11)202X13(3)125X16(12)77X4X5(4)50X(2X4)X25(13)27X99(5)7x8X3X125(14)48X250(6)26X103(15)98+303(7)501X12(16)49+49X49(8)25X(40+8)(17)55X25+25X45(9)39X14+61X14(18)123X67-23X6739x101-3999X64+6476X23+24X2312+19X1221+254+79+46(29)

2、480+15(30)21X99(31)125X32(32)12X301(33)75X3X4(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)25X 16X 5(34) 19+99X1952X32+48X 32(35) 256X9-46X918X13718X37(36) 13+13X49450+ 18(37) (25+125)X8420+ 35(38) 541X6767X44143X201102X354X22X25X7+62X72X8+148X8(49)68X48+68X2(50)5X27+63X5(51)12X(405)(52)64X914X9(53)35X98(

3、54)23X13434X23(39)(40)(41)(42)(43)(44)(45)(46)(47)(48)X401(55)102X453X23(56)648+203X 15(57)98X32125X(8+16)(58)44X25(59)63+15X2(69)36X25(60)43+43X39(70)304+297(61)27X37+37x23(71)18X45+18X55(62)256X7-56X7(72)226X13-26X13(63)48X101-48(73)15X301-15(64)99X62+62(74)(30+8)X25(65)41X99(75)25X65+25X25(66)765

4、+98(76)75X141-75X40(67)56(77)125X18(68)201X34(78)25X35+2571X2371X13125X(808)1C88282c2547101X8989X22+22X12X57+43X282X41x19X4+99+473X3734X201(89)25X5X16(90)56+56X49(91)57X26+26X43(92)373X9-73X9(93)78X101-78(94)199X53+53(95)25X12424X25(96)250X28(97)125X16(98)250X9X4(79)(80)(81)(82)(83)(84)(85)(86)(87)(

5、88)(99)48X125(109)101X8585(100)24X250(110)25X19(101)402X15(111)152X49+51X152(102)5+250)X4(112)50X(60+8)(103)99X9+199(113)93X99+93(104)7X18+82X27(114)13X125X8(105)X46+46X18(115)125X17+63X125(106)401X25(116)492-145-155(107)2X101(117)43X25X2(108)42X(301)(118)24X25(119) 28x111-28X11(120) 63X8+91X63+63(1

6、) 67+42+33+58=(67+33)+(42+58)=100+100=200(2) 258582674=258-58-(26+74)=200-100=100(3) 125X16=125X8X2=1000X2=2000(4) 50X(2X4)X25=(50X2)x(4X25)=100x100=10000(5) 7X8X3X125=(7X3)x(8X125)=21X1000=21000(6) 26X103=26X(100+3)=26X100+26X3=2600+78=2678501X12=(500+1)X12=500X12+1X12=6000+12=1000+200=1200(9) 39 X

7、14+61 X 14=(39+61) X 14=100 X 14=1400(10) 163 X 8+37X8=(163+37) X 8=200 X 8=1600(11) 202 X 13=(200+2) X 13=200 x 13+2X 13=2600+26=2626(12) 77X4X5=77 X (4X5)=77 X 20=1540(13) 27X99=27 X 1 100-1 )=27 X 100-27 X1=2673(14) 48 X250=12 X 4X250=12 X ( 4X250)=12 X 1000=12000(15) 98 +303=98+3+300=102+300=402

8、(16) 49 +49X49=49X ( 1+49)=6012=3200(26) 18X 137 18X 37=18 X ( 137-37 )=18 X100=1800(27) 450+ 18=450+ ( 3X6)=450+3+6=150+6=25(28) 420+ 35=420+ ( 7X5)=420+7+5=60+5=12(29) 480+ 15=480+3+5=160+5=32(30) 21 X99=21 X ( 100-1 )=21X100-21 X 1=2100-21=2079(31) 125X 32=125X8X4=1000X 4=4000(32) 12X301=12X(300+

9、1)=12X300+12X 1=3600+12=3612(33) 75X3X4=2450(17) 55X25+25X45=25X(55+45)=25X100=2500(18) 123X67-23X67=(123-23)X67=100X67=6700(19) 39X10139=39X1101-1)=39x100=3900(20) 99X64+64=(99+1)X64=100X64=6400(21) 76X23+24X23=(76+24)X23=100X23=2300(22) 12+19X12=12X11+19)=12X20=240(23) 21+254+79+46=(21+79)+(254+46

10、)=100+300=400(24) 25X16X5=25X4X4X5=(25X4)X(4X5)=100X20=2000(25) 52X32+48X32=(52+48)X32=300x3=900(34) 19+99X19=19X(99+1)=1900(35) 256X946X9=(256-46)X9=210X9=1890(36) 13+13X49=13X(1+49)=13X50=650(37) (25+125)X8=25X8+125X8=200+1000=1200(38) 541X67-67X441=(541-441)X67=100X67=6700(39) 43X201=43X(200+1)=4

11、3X200+43X1=8600+43=8643(40) 102X35=(100+2)X35=100X35+2X35=3500+70=3570(41) 304X22=(300+4)X22=300X22+4X22=6600+88=6688(42) (30+4)X25=750+100=850(43) 38X7+62X7=(38+62)X7=100X7=700(44) 152X8+148X8=(152+148)X8=300X8=2400(45) 16X401=16X(400+1)=16X400+16X1=6400+16=6416(46) 103X23=(100+3)X23=100X23+3X23=23

12、00+69=2369(47) (30+2)X15=30X15+2X15=450+30=480(48) 125X(8+16)=125X8+125X16=1000+2000=3000(49) 68X48+68X2=68X(48+2)=68X50=3400(50) 5X27+63X5=5X(27+63)=5X100=500(51) 12X(405)=480-60=43X40=1720(61) 27X37+ 37X 23=(27 +23) X 37=50X37=1850(62) 256X 7- 56X 7=(256 56) X 7=200X7=1400(63) 48X101-48=48X(101-1)

13、=48X 100=4800(64) 99X62+ 62=(99+1) X 62=100 X 62=6200(65) 41 X99=41X(100-1)=41X100-41 X 1=4100-41=4059(66) 765+ 98=765+100-2=863(67) 560+ 16=560 + (4 X 4)=560 + 4 + 4=420(52) 64X914X9=(64-14)X9=50X9=450(53) 35X98=35X(100-2)=35X100-35X2=3500-70=3430(54) 23X13434X23=23X(13434)=23X100=2300(55) 102X45=(

14、100+2)X45=100X45+2X45=4500+90=4590(56) 648+203=648+2+201=650+201=851(57) 98X32=(100-2)X32=100X32-2X32=3200-64=3136(58) 44X25=11X4X25=11X100=1100(59) 63+15X2=63+30=93(60) 43+43X39=2250(78) 25X35+ 25=25 x(35+1)=25 X 36=25 X 4 X 9=900(79) 71 X23- 71 X 13=71 X (23-13)=710(80) 125X ( 808)=125 X 80-125 X8

15、=10000-1000=9000(81) 101X 89-89=(101-1) X 89=8900(82) 88X22+ 22X 12=(88+12) X22=2200(83) 28X57+ 43X 28=28 X (57+43)=2800(84) 202X 41=(200+2) X 41=200 X 41+2X41=8200+82=8282=35=75X101(68) 201X34=7575=(200+1)X34(77)125X18=200X34+1X34=125X(10+8)=6800+34=125X10+125X8=6834=1250+1000(69) 36X25=9X4X25=9X10

16、0=900(70) 304+297=301+3+197=501(71) 18X45+18X55=(45+55)X18=100X18=1800(72) 226X13-26X13=(226-26)X13=200X13=2600(73) 15X301-15=15x(301-1)=15X300=4500(74) (30+8)X25=30X25+8X25=750+200=950(75) 25X65+25X25=25X(65+25)=25X100=2500(76) 75X14175X40=75X(141-40)(85) 25X 19X4=25X 4X 19=1900(86) 47X99+47=47 X=7

17、8X(101-1)=7800(94) 199X53+53=(199+1)X53(99+1)=10600(95) 25X12424X25=25X(124-24)=2500(96) 250X28=250X4X7=1000X7=7000(97) 125X16=125X8X2=1000X2=2000=47 X100=4700(87) 103X 37=(100+3) X 37=100 X 37+3X37=3700+111=3811(88) 34X201=34 X (200+1)=34 X 200+34X1=6800+68=6868(89) 25X5X 16=25 X 4 X (4 X 5)=100 X

18、20=2000(90) 56 + 56X49=56 X(49+1)=56 X 50=2830(91) 57X26+26X43=(57+43) X 26=100 X26=3600(92) 373X 973X9=(373-73) X 9=300 X 9=2700(93) 78X 101-78(98) 250X9X4=250X4X9=1000X9=9000(99) 48X125=6X(8X125)=6000(100) 24X250=6X(4X250)=6000(101) 402X15=(400+2)X15=400X15+2X15=6000+30=6030(102) (25+250)X4=25X4+250X4=100+1000=1100(103) 199X9+199=199X(9+1)=1990(104) 27X18+82X