(45)整数简便运算120题(有参考答案过程)

1、四年级数学整数简便运算 120 道 11) 11) 202X13 12) 77X4X 5(1) 67+ 42 + 33+58(2) 258 58- 26- 74(3) 125X 16(13) 27X99(4) 50x (2X 4) x 25(14) 48X250( 15) 98+303(5) 7X8X3X 125(6) 26 x 103(16) 49+49X 49 501x 12( 17) 55X25+ 25X 45(8) 25X (40+8)( 18) 123X6723X 67(9) 39x 14 + 61X14(19) 39X101 39(20) 99X64+ 64(10) 163X8+

2、37X 8(31) 125X32(21) 76X23+24X23(32) 12X301(22) 12+19X12(23) 21 + 254+79+46(33) 75X3X4(24) 25X 16X5(34) 19+99X 19(25) 52X32+48X32(35) 256X9-46X9(26) 18X 137-18X37(36) 13+13X 49(27) 450-18(37) (25+125) X8(28) 420+35(38) 541X67-67X441(29) 480-15(39) 43X201(30) 21X99(40) 102X35(41) 304X22(51) 12X (40 5

3、)(42) (30+4) X 25(52) 64X9 14X9(53) 35X98(43) 38X 7 + 62X7(44) 152X8+ 148X8(54) 23X 134 34X23(45) 16X401(55) 102X45(46) 103X23(56) 648+203(47) (30 + 2) X 15(57) 98X32(48) 125X (8+16)(58) 44X25(49) 68X 48+ 68X 2(59) 63+ 15X2(50) 5X27 + 63X5(60) 43+43X 39(61) 27X 37+ 37X 23(71) 18X45+ 18X 55(62) 256X7

4、 56X 7(72) 226X1326X 13(63) 48X 101-48(73) 15X30115(64) 99X 62+62(74) ( 30+8) X 25(65) 41X99(75) 25X65+25X 25(66) 765+98(76) 75X 141 75X 40(67) 560+16(77) 125X18(68) 201X34(78) 25X35+ 25(69) 36 X 25(79) 71X23 71X 13(70) 304+297(80) 125X (80 8)(81) 101X89 89(91) 57X26+ 26X 43(82) 88X 22+22X 12(92) 37

5、3X973X9(83) 28X 57+ 43X 28(93) 78X 101 78(84) 202X41(94) 199X53+53(85) 25X 19X4(95) 25X 124 24X25(86) 47+ 99+ 47(96) 250X28(87) 103X37(97) 125X16(88) 34X201(98) 250X9X4(89) 25X5X 16(99) 48X 125(90) 56+ 56X49(100) 24X250(101) 402X15(111) 152X49 + 51X 152(102) 25+250) X4( 112) 50X (60+8)(103) 199X9+19

6、9( 113) 93X99+93(104) 27X 18+ 82X27(114) 13X125X8(105) 2X46+ 46X 18( 115) 125X 17 + 63X 125(106) 401X25(116) 492-145-155(107) 72 X 101(117) 43X25X2(108) 42X (301)(118) 24X25(109) 101X85 85( 119) 28X11128X 11(110) 25 X 19( 120) 63X8+91X63+ 63=25X 40+25X 8=1000+200=1200(9) 39X 14+61X 14=(39+61) X 14=1

7、00X 14=1400(10) 163X 8+37X8=(163+37) X 8=200X 8=1600(11) 202X13=(200+2) X 13=200 X 13+2X 13=2600+26=2626(12) 77X4X 5=77X (4X5)=77X 20=1540(13) 27X99=27 X ( 100-1 )=27 X 100-27 X 1=2673(14) 48 X 250=12X4X250=12X (4X250)=12X 1000=12000(15) 98+303=98+3+300=102+300=402(16) 49+49X49=49X ( 1+49)(1) 67+ 42

8、+ 33+ 58=(67+33) + (42+58)=100+100=200(2) 258- 58- 26- 74=258- 58- (26+74)=200-100=100(3) 125X 16=125X 8X 2=1000X2=2000(4) 50X ( 2X 4) X 25=(50X2) x ( 4X 25)=100x 100=10000(5) 7X8X3X 125=(7X 3) x ( 8X 125)=21X 1000=21000(6) 26X 103=26 X ( 100+3)=26 X 100+26X 3=2600+78=2678(7) 501 X 12=(500+1) X 12=5

9、00 X 12+1 X 12=6000+12=6012(8) 25X ( 40+8)=49 X 50(17) 55X25 + 25X45(26) 18X 13718X37=2450=3200=100X 32=300 3=900=25 X (55+45)=25X100=2500(18) 123X 6723X 67=(123-23 ) X 67=100X 67=6700(19) 39X101-39=39 X (101-1 )=39x100=3900(20) 99X64 + 64=(99+1) X 64=100X 64=6400(21) 76X 23+ 24X 23=(76+24) X 23=100

10、X 23=2300(22) 12+19X12=12X (1+19)=12X20=240(23) 21 + 254 + 79+46=(21+79) + (254+46)=100+300=400(24) 25X 16X 5=25X4X4X5=(25X4) X ( 4X 5)=100 20=2000(25) 52X 32+48X 32=(52 + 48) X 32=18X ( 137-37 )=18X 100=1800(27) 450+ 18=450+ ( 3X6)=450+3+6=150+6=25(28) 420+35=420+ ( 7X 5)=420+7+5=60+5=12(29) 480+ 1

11、5=480 3 5 =160 5=32(30) 21 X99=21 X 1 100-1 )=21 X 100-21 X 1=2100-21=2079(31) 125X 32=125X8X4=1000X4=4000(32) 12X301=12 X (300+1)=12 300+12 1=3600+12=3612(33) 75X3X4=75 4 3(34) 19+99X 19(43) 38X7+62X 7=19X (99+1)=1900(35) 256X946X9=(256-46) X9=210X 9=1890(36) 13+13X49=13 X (1+49)=13X 50=650(37) ( 2

12、5+125) X 8=25X 8+125X8=200+1000=1200(38) 541 X67 67X441=(541-441) X67=100 67=6700(39) 43X 201=43 X (200+1)=43 200+43 1=8600+43=8643(40) 102X35=(100+2)35=100 35+2 35=3500+70=3570(41) 304X22=(300+4) X 22=300 22+4 22=6600+88=6688(42) ( 30+4) X 25=30X 25+4X25=750+100=850=(38+62)7=100 7=700(44) 152X 8+14

13、8X8 =(152+148)8=300 8=2400(45) 16X401=16 (400+1) =16 400+16 1=6400+16=6416(46) 103X23=(100+3) X23 =100 23+3 23 =2300+69 =2369(47) ( 30+2) X 15=30 X 15+2 X 15 =450+30=480(48) 125X ( 8+16) =125X 8+125X 16 =1000+2000 =3000(49) 68X48 + 68X2=68 X (48+2)=68 X 50=3400(50) 5X 27+63X5=5X(27 + 63)=5X 100=500(

14、51) 12X (405)=480-60=12X40-12 X 5=420=1720=125 10+125 8=47 X (99 +1)(52) 64X 9 14X9=(64-14) X 9=50X 9=450(53) 35X 98=35 X (100-2)=35 X 100-35 X2=3500-70=3430(54) 23X 134 34X23=23 X (134 -34)=23 100=2300(55) 102X45=(100+2) X 45=100X45+2X45=4500 + 90=4590(56) 648 + 203=648+2+201=650+201=851(57) 98X 32

15、=(100-2)32=100 32-2 32=3200-64=3136(58) 44X25=11 X 4X25=11100=1100(59) 63+ 15X 2=63+30=93(60) 43+43X 39(61) 27X37+37X23=(27 +23) X37=50 X 37=1850(62) 256X 756X7=(256 56) X 7=200 X 7=1400(63) 48X101-48=48 X (101-1)=48 100=4800(64) 99X62 + 62=(99+1) X62=100 62=6200(65) 41 X99=41 X (100-1)=41 100-411=4

16、100-41=4059(66) 765+ 98=765+100-2=863(67) 560+ 16=560 + (4 X4)=560 + 4+4=140 + 4=35(68) 201X 34=(200+1) X 34=6834(69) 36X 25=9X4X25=9x100=900(70) 304 + 297=301+3+197=501(71) 18X45+18X55=(45+55) X 18=100 18=1800(72) 226X 13-26X 13=(226-26) X 13=200 13=2600(73) 15X 301-15=15X (301-1)=15X 300=4500(74)

17、( 30+8) X 25=30X 25+8X25=750+200=950(75) 25X 65+ 25X 25=25X(65 + 25)=25 100=2500(76) 75X 14175X40=75 X (141-40)=75 101=7575(77) 125X 18=125 (10+8)=1250+1000=2250(78) 25X35 + 25=25 X (35+1)=25 36=25 4 9=900(79) 71 X23-71 X 13=71 (23-13)=710(80) 125X ( 808)=125 X 80-125 X8=10000-1000=9000(81) 101X 89-

18、89=(101-1) X89=8900(82) 88X22 + 22X 12=(88+12) X22=2200(83) 28X57 + 43X28=28 X (57+43)=2800(84) 202X41=(200+2) X41=200 41+2 41=8200+82=8282(85) 25X 19X4=25 4 19=1900(86) 47X99 + 47=47X100=4700(87) 103X37=(100+3) X 37=100X 37+3X37=3700+111=3811(88) 34X 201=34 X (200+1)=34 X 200+34 X 1=6800+68=6868(89

19、) 25X 5X 16=25X4X(4 X5)=100 20=2000(90) 56+56X 49=56 (49+1)=56 50=2830(91) 57X26+26X43=(57+43)26=100 26=3600(92) 373X9 73X9=(373-73) X9=300 9=2700(93) 78X 101-78=78 X (101 -1)=7800(94) 199X53+53=(199+1)53=10600=25 X (124 -24) =2500(96) 250X 28=250 4 7=1000 7=7000(97) 125X 16=125 8 2=1000 2=2000(98) 250X 9X4=250 4 9=1000 9=9000(99) 48X 125 =6 (8125)=6000(100) 24X 250 =6 (4 250) =6000(101) 402X15 =(400+2)15=400 15+2 15 =6000+30 =6030(102) (25+250) X 4=25X4+250X4=100+1000 =1100(103) 199X 9+199=199X (9+1)=1990(95) 25X 124 24X 25(104) 27X 18 + 82X27=27X(18 + 82)=2700(105) 2X46+46X 18=46