整數(shù)簡便運算題有答案過程

1、四年級數(shù)學整數(shù)簡便運算 120 道(1) 67+42 + 33 + 58(10) 163X8 + 37X8(11) 202X13(2) 258-58-26-74(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) 123X67-23X67(19) 39X101-39(29) 4804-15(20) 99X

2、64 + 64(30) 21X99(21) 76X23 + 24X23(31) 125X32(22) 12 + 19X12(32) 12X301(23) 21 + 254 + 79+46(33) 75X3X4(2456) 25X16X55182X13327+-18(365) 256X9-46X913 +13X4(34) 19 + 99X19(27)(37) (25+125) X8450 18 (28) (38) 541X67-67X441 420435(39) 43X201(49) 68X48 + 68X2(40) 102X35(50) 5X27 + 63X5(41) 304X22(51) 1

3、2X (40-5)(52) 64X9-14X9(42) (30+4) X25(53) 35X98(43) 38X7 + 62X7(44) 152X8 + 148X8(54) 23X134-34X23(45) 16X401(55) 102X45(46) 103X23(56) 648 + 203(47) (30 + 2) X15(57) 98X32(48) 125X (8+16)(58) 44X25(72) 10X7X13279859XX40X13X70425+1+-75(31+5-494)8 63 + 15X2(60) 43 + 43X39(79) 71X23-71X 13(80) 125X (

4、80-8)(81)101X89-89(82) 88X22 + 22X12(83) 28X57 + 43X285265X+55X61X64(91) 57X26 + 26X43(92) 373X9-73X9(93) 78X101-78(84) 202X41(94) 199X53 + 53(85) 25X19X4(95) 25X124-24X25(86) 47 + 99 + 47(96) 250X28(87) 103X37(97) 125X 16(88) 34X201(98) 250X9X4(99)48X125(109) 101X85 85(100) 24X250(110) 25X19(101) 4

5、02X15(111) 152X49 + 51X152(102) 25+250) X4(112) 50X (60+8)(103) 199X9 + 199(113) 93X99+93(104) 27X18+82X27(114) 13X125X8(105) 2X46 + 46X18(115) 125X17 + 63X125(106) 401X25(116) 492-145-155(107) 72X101(117) 43X25X2(108) 42X (30-1)(118) 24X25(119) 28X111-28X11(120) 63X8 + 91X63 + 63參考答案=25X40+25X8=100

6、0+200(1) 67 + 42 + 33 + 58=(67+33) + (42+58)=100*100=200(2) 258-58-26-74 =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=2678(7) 501X12 =(500+1) X12 =

7、500X12+1X12 =6000+12 =6012=49 X(1+49)(8) 25X (40+8)二(52 + 48) X32 =100X32(26) 18X137-18X37=18X (137-37)=18X100=1800(27) 4504-18=4504- (3X6)二 450F3 十 6=150八-6=25(28) 420*35=4204- (7X5)=4204-74-5二60 十5=12(29) 4804-15=480*3 十 5=1604-5=32(30) 21X99=21 X (100-1) =21X100-21X1 =2100-21=2079(31) 125X32 =125

8、X8X4=1000X4=4000(32) 12X301二 12X (300+1) =12X300+12X1=3600+12=3612(33)75X3X4=42945X050( 17) 55X25 + 25X45=25X (55+45)=25X100=2500(18) 123X67-23X67=(123-23) X67 =100X67=6700(19) 39X101-39=39 X (101-1)=39X100 二 3900(20) 99X64 + 64=(99+1) X64=100X64=6400(21) 76X23 + 24X23=(76+24) X23=100X23=2300(22) 12

9、 + 19X12=12X (1+19)=12X20=240(23) 21 + 254 + 79 + 46=(21 + 79) + (254 + 46) =100+300=400(24) 25X16X5=25X4X4X5=(25X4) X (4X5)= 100X20=2000(25) 52X32 + 48X32=3200=75X4X3=30X25+4X25=750+100=850(43) 38X7 + 62X7二( 38+62) X7=100X7=700(44) 152X8 + 148X8= (152+148) X8=300X8=2400(45) 16X401 =16X (400+1)=16X4

10、00+16X1=6400+16=6416(46) 103X23= (100+3)X23=100X23+3X23 =2300 + 69=2369(47) (30 + 2) X15=30X15+2X15二 450+ 30 二 480(48) 125X (8+16) =125X8+125X16=1000+2000=3000(49) 68X48 + 68X2 =68X (48+2)二 68 X 50=3400(50) 5X27 + 63X5=300X3=900(34) 19 + 99X19=19X (99 十 1)=1900(35) 256X9-46X9= (256-46)X9=210X9=1890(

11、36) 13+13X49=13X (1+49)=13X50=650(37) (25+125) X8=25X8+125X8=200八1000= 1200(38) 541X67-67X441 = (541-441)X67=100X67=6700(39) 43X201=43X(200+1)=43X200+43X1 二8600+43 二 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=5X (27 + 63)=11

12、X100=1100=5X100=500(51) 12X (40-5)=12X40-12X5=480-60=420(52) 64X9-14X9=(64-14) X9=50X9=450(53) 35X98 =35X(100-2) =35X100-35X2 =3500-70=3430(54) 23X134-34X23=23X (134-34)=23X100=2300(55) 102X45 = (100+2) X45 =100X45+2X45 =4500 + 90 =4590(56) 648 + 203 =648+2+201二 650+201 二 851(57) 98X32 = (100-2) X32

13、 =100X32-2X32 =3200-64=3136(58) 44X25(59) 63 + 15X2=63+30=93(60) 43 + 43X39=43X (1+39)=43X40=1720(61) 27X37 + 37X23+ 23)X37 =50X37 =1850(62) 256X7-56X7 = (256-56) X7 =200X7 =1400(63) 48X101-48=48 X (101-1) =48X100二 4800(64) 99X62 + 62二( 99+1) X62=100X62 二 6200(65) 41X99 =41X (100-1) =41X100-41X1 =41

14、00-41=4059(66) 765 + 98=765+100-2二 863(67) 5604-16(27=11X4X25=5604-(4X4)=5604-44-4 =1404-4=35(68) 201X34 = (200+1) X34 =200X34+1X34 =6800 + 34 =6834(69) 36X25二 9X4X25二 9X100 二 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) 15

15、X301-15= 15X(301-1) =15X300=4500(74) (30+8) X25=30X25+8X25 =750+200=950(75) 25X65 + 25X25=25X(65 + 25)=2500(76) 75X141-75X40=75X (141-40)=75X101=7575(77) 125X18=125X(10+8) =125X10+125X8=1250+1000=2250(78) 25X35 + 25=25X (35+1)=25X36=25X4X9二 900(79) 71X23-71X13二 71X (23-13)=710(80) 125X (80-8) =125X8

16、0-125X8 =10000-1000二 9000(81) 101X89-89= (101-1)X89二 8900(82) 88X22 + 22X12= (88+12)X22=2200(83) 28X57 + 43X28=28X (57+43)=2800=25X100(84) 202X41=300X9 =2700(93) 78X101-78=78 X (101-1)二 7800(94) 199X53 + 53= (199+1)X53=10600(95) 25X124-24X25=25X (124-24)=2500(96) 250X28=250X4X7=1000X7=7000(97) 125X1

17、6=125X8X2=1000X2=2000(98) 250X9X4 =250X4X9 =1000X9 二9000(99) 48X125二 6X (8X125)二 6000(100) 24X250二 6X (4X250)二 6000(101) 402X15 =400X15+2X15=(400+2)X15=(200+2) X41=200X41+2X41=8200+82=8282(85) 25X19X4 =25X4X19=1900(86) 47X99 + 47=47 X (99 + 1)=47X100=4700(87) 103X37= (100+3) X37= 100X37+3X37=3700+11

18、1=3811(88) 34X201=34X (200+1)=34X200+34X1=6800+68 二 6868(89) 25X5X16=25X4X (4X5)= 100X20=2000(90) 56 + 56X49=56X(49+1)=56X50=2830(91) 57X26 + 26X43= (57+43) X26=100X26=3600= (373-73)X9(92) 373X9-73X9=6000+30=6030(102) (25+250) X4=25X4+250X4=100 十 1000=1100(103) 199X9 + 199=199X (9+1)=1990(104) 27X18 + 82X27=27 X (18 + 82)=2700(105) 2X46 + 46X18=46X(18+2)=46X20=920(106) 401X