小学四年级数学简便运算归类

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小学四年级数学简便运算归类   导语:聪明的资质、内在的干劲、勤奋的.工作态度和坚韧不拔的精神,这些都是科学研究成功所需的其他条件。下面是小编为大家整理的,数学知识,更多相关信息请关CNFLA学习网!  第一类:加  65+73+135 357+288+143 272+68+28 =65+135+73 =3……

小学四年级数学简便运算归类

  导语:聪明的资质、内在的干劲、勤奋的.工作态度和坚韧不拔的精神,这些都是科学研究成功所需的其他条件。下面是小编为大家整理的,数学知识,更多相关信息请关CNFLA学习网!

  第一类:加

  65+73+135 357+288+143 272+68+28 =65+135+73 =357+143+288 =272+28+68 =200+73 =500+288 =300+68 =273 =788 =368

  129+235+171+165 17+145+23+35 999+99+9+3 =129+171+235+165 =17+23+145+35 =999+1+99+1+9+1 =300+400 =40+180 =1000+100+10 =700 =220 =1110

  第二类:减

  400-256-44 517-53-47 284-159-41

  =400-(256+44) =517-(53+47) =284-(159+41) =400-300 =517-100 =284-200

  =100 =417 =84

  258-42-16 545-167-145 478-47-178 =258-(42+16) =545-145-167 =478-178-47 =258-58 =400-167 =300-47

  =200 =233 =253

  344-(144+37) 236-(177+36)

  =344-144-37 =236-177-36

  =200-37 =236-36-177

  =163 =200-177

  =23

  第三类:乘

  8×(125×13)

  =8×125×13 =

  =1000×13 =250

  =13000 =1000

  =1000000

  88×125

  =11×8×125 =9

  =11×1000 =9

  =11000 =9000 =200000

  42×125×8×5

  =42×5×125×8 =25

  =210×1000 =100

  =210000 =1100000

  (250×125)×(4×8) 250×125×4×8 ×4×125×8 ×1000 72×125 125×64×25 ×8×125 =125×8×2×4×25 ×1000 =1000×2×100 25×4×88×125 ×4×11×8×125 ×11×1000

  第四类:乘

  (12+50)×40 125×(40-8) 76×103

  =12×40+50×40 =125×32 =76×(100+3) =480+2000 =125×8×4 =76×100+76×3 =2480 =1000×4 =7600+228 =4000 =7828

  18×125

  =9×2×125 = 25

  =9×250 =100

  =2250 =1100 =1050

  99×9

  =(100-1)×9 =100

  =900-9 =7800-78

  =891 =7722

  第五类:乘

  45×37+37×55

  =37×(45+55) =28

  =37 ×100 =28

  =3700 =2800 =230

  25×44 ×4×11 =21×11 =2199×78 ×78-78 28×21+28×79 ×(21+79) =23 ×100 =2342×25 ×2×25 ×50 17×23-23×7 ×(17-7) ×10

  38×46+64×38 99×32+32 46+46×59 =38×(46+64) =32×(99+1) =46×(1+59) =38×110 =32×100 =46×60 =38×100+38×10 =3200 =2760

  =3800+380

  =4180

  167×2+167×3+167×5 39×8+6×39-39×4 =167×(2+3+5) =39×(8+6-4)

  =167×10 =39 ×10

  =1670 =390

  23×2×4+25×4×2+27×1×8+25×8×1 99×22+33×34

  =23×8+25×8+27×8+25×8 =33×3×22+33×34 =(23+25+27+25)×8 =33×66+33×34 =100×8 =33×(66+34) =800 =33×100 =3300

  第六类:除

  360÷4÷9 250÷5÷2 600÷12÷5 =360÷36 =250÷10 =600÷60 =10 =25 =10

  800÷5÷8 480÷5÷48 240÷5÷12 =800÷40 =480

  =20 =10

  =2 =4

  420÷35

  =420÷7÷5 =(2400

  =60÷5 =9600

  =12 =96 =62.4

  第七类:加减

  92+99 197+102 354-108

  =91+1+99 =197+2+100 =354-100-8

  =91+100 =199+100 =254-8

  =191 =299 =246

  ÷48÷5 =240÷5 =202400÷25 ×4)÷(25×4) =(7800÷100 =62400÷12÷5 ÷5 7800÷125 ×8)÷(125×8) ÷1000

  323+189-123 248-86+48 672-36+64

  =323-123+189 =248-(86-48) =636+64

  =200+189 =248-38 =700

  =389 =210

  (6467-832)+(1832-1467) 1530+(592-530)-192 =6467-832+1832-1467 =1530+592-530-192 =6467-1467+1832-832 =1530-530+592-192 =5000+1000 =1000+400

  =6000 =1400

  (2+4+6+……+98+100)-(1+3+5+……+97+99)

  =(2-1)+(4-3)+(6-5)+。。。。+(98-97)+(100-99)

  =50

  第八类:乘除

  960×46÷48 99000÷121×11 3702×38÷1234 =960÷48×46 =99000÷(121÷11) =3702÷1234×38 =20×46 =99000÷11 =3×38 =920 =9000 =114

  640÷(16÷4) 1000÷(125÷4) =640÷4 =1000÷125×4

  =160 =8×4

  =32

  第九类:加减乘除

  (98+147)÷49

  =98÷49 +147÷49

  =2+3 =10-1 =10-1 =5 =9 =9

  1736÷28+1064÷28

  =(1736+1064)÷28 =125=2800÷28 =125=100 =125 =1000

  =110000 230-23)÷23 (250-25)÷25 ÷23 -23÷23 =250÷25-25÷25 125×(860+240÷12)×(860+20) ×880 ×8×110 ×110 ( =230