整数简便运算120题(有答案过程).pdf

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1、第 1 页 共 15 页 四年级数学整数简便运算120 道(有答案) (1) 67423358 (2) 258582674 (3) 12516 (4) 50(24)25 (5) 7 83125 (6) 26103 (7) 50112 (8) 25(40+8) (9) 39146114 (1 0) 1638378 (11) 20213 (12) 77 45 (13) 27 99 (14) 48 250 (15) 98 303 (16) 49 4949 (17) 55 252545 (18) 123 672367 第 2 页 共 15 页 (19) 39 10139 (20) 99 6464 (2

2、1) 76 232423 (22) 12 1912 (23) 21 2547946 (24)25165 (25)52324832 (26)181371837 (27)45018 (28)42035 (29)48015 (30)2199 (31)12532 (32)12301 (33)7534 (34)199919 (35)2569469 (36)131349 (37) (25+125)8 (38)5416767441 第 3 页 共 15 页 (39)43201 (40)10235 (41)30422 (42) (30+4)25 (43)387627 (44)15281488 (45)1640

3、1 (46)10323 (47) (302)15 (48)125(8+16) (49)6848682 (50)527635 (51)12(405) (52)649149 (53)3598 (54)231343423 (55)10245 (56)648203 (57)9832 (58)4425 第 4 页 共 15 页 (59)63152 (60)434339 (61)27373723 (62)2567567 (63)4810148 (64)996262 (65)4199 (66)76598 (67)56016 (68)20134 (69)3625 (70)304297 (71)18451855

4、 (72)226132613 (73)1530115 (74) (30+8)25 (75)25652525 (76)751417540 (77)12518 (78)253525 第 5 页 共 15 页 (79)71237113 (80)125(808) (81)1018989 (82)88222212 (83)28574328 (84)20241 (85)25194 (86)479947 (87)10337 (88)34201 (89)25516 (90)565649 (91)57262643 (92)3739739 (93)7810178 (94)1995353 (95)251242425

5、 (96)25028 (97)12516 (98)25094 第 6 页 共 15 页 (99)48125 (100)24250 (101)40215 (102)25+250)4 (103)1999199 (104)27188227 (105)2464618 (106)40125 (107)72101 (108)42(301) (109)1018585 (110)2519 (111)1524951152 (112)50(608) (113)939993 (114)131258 (115)1251763125 (116)492145155 (117)43252 (118)2425 第 7 页 共

6、 15 页 (119)281112811 (120)638916363 第 8 页 共 15 页 整数简便运算120 道参考答案: (1) 67 423358 =(67+33)+(42+58) =100+100 =200 (2) 258 582674 =25858(26+74) =200-100 =100 (3) 125 16 =12582 =10002 =2000 (4) 50 (24)25 =(502)( 425) =100100 =10000 (5) 7 83125 =(73)( 8125) =211000=21000 (6) 26 103 =26( 100+3) =26100+263

7、=2600+78 =2678 (7) 501 12 =(500+1) 12 =50012+112 =6000+12 =6012 (8) 25 (40+8) =2540+258 =1000+200 =1200 (9) 39 146114 =(39+61)14 =10014=1400 (10) 163 8378 =(163+37) 8 =2008=1600 (11) 202 13 =(200+2) 13 =20013+213 =2600+26 =2626 (12) 77 45 =77( 45) =7720=1540 (13) 27 99 =27( 100-1) =27100-271 =2673 (

8、14) 48 250 =124250 =12( 4250) =121000 =12000 (15) 98 303 =98+3+300 =102+300 =402 (16) 49 4949 =49(1+49) =4950 =2450 第 9 页 共 15 页 (17) 55 252545 =25(55+45) =25100 =2500 (18) 123 672367 =(123-23) 67 =10067=6700 (19) 39 10139 =39(101-1) =39100=3900 (20) 99 6464 =(99+1)64 =10064 =6400 (21) 76232423 =(76

9、+24) 23 =10023 =2300 (22) 12 1912 =12( 1+19) =1220 =240 (23) 212547946 =(2179)+(25446) =100+300=400 (24)25165 =25445 =(254)( 45) =10020=2000 (25)52324832 =(5248)32 =10032 =3200 (26)181371837 =18(137-37) =18100 =1800 (27)45018 =450( 36) =45036 =1506 =25 (28)42035 =420( 75) =42075 =605=12 (29)48015 =4

10、8035 =1605 =32 (30)2199 =21( 100-1 ) =21100-211 =2100-21 =2079 (31)12532 =12584 =10004=4000 (32)12301 =12(300+1) =12300+121 =3600+12=3612 (33)7534 =7543 =3003=900 第 10 页 共 15 页 (34)199919 =19(99+1) =1900 (35)2569469 =(256-46) 9 =2109=1890 (36)131349 =13(1+49) =1350=650 (37)( 25+125)8 =258+1258 =200+

11、1000 =1200 (38)5416767441 =(541-441) 67 =10067=6700 (39)43201 =43(200+1) =43200+431 =8600+43=8643 (40)10235 =(100+2) 35 =10035+235 =3500+70 =3570 (41)30422 =(300+4)22 =30022+422 =6600+88 =6688 (42)( 30+4) 25 =3025+425 =750+100=850 (43)387627 =(38+62)7 =1007 =700 (44)15281488 =(152+148)8 =3008=2400 (

12、45)16401 =16(400+1) =16400+161 =6400+16=6416 (46)10323 =(100+3) 23 =10023+323 =230069 =2369 (47)( 302)15 =3015+215 =45030=480 (48)125( 8+16) =1258+12516 =1000+2000 =3000 (49)6848682 =68(48+2) =6850 =3400 (50)527635 =5(27 63) =5100=500 (51)12(405) =1240-125 =480-60 第 11 页 共 15 页 =420 (52)649149 =(64-

13、14)9 =509=450 (53)3598 =35(100-2) =35100-352 =3500-70 =3430 (54)231343423 =23(134 34) =23100=2300 (55)10245 =(100+2) 45 =10045+245 =450090 =4590 (56)648203 =648+2+201 =650+201=851 (57)9832 =(100-2) 32 =10032-2 32 =3200-64 =3136 (58)4425 =11425 =11100=1100 (59)63152 =63+30=93 (60)434339 =43(1+39) =4340 =1720 (61)27373723 =(27 23) 37 =5037 =1850 (62)2567567 =(256 56)7 =2007 =1400 (63)4810148 =48(101-1) =48100 =4800 (64)996262 =(99+1)62 =10062=6200 (65)4199 =41(100-1) =41100-411 =4100-41 =4059 (66)76598 =765+100-2 =863 (67)56016 =560(44) =56044 =1404 =35

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