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四年级下册数学简便运算练习题及答案

2024-11-10 18:38:30 51

1.四年级下册数学简便运算练习题及答案 篇一

  1、21+22+23+24+……+100

  =(21+100)+(22+99)+……+(60+61)

  =121+121+……+121

  =121×40

  =4840

  2、21+23+25+27+29+31

  =(21+31)×6÷2

  =156

  3、312+315+318+321+324

  =(318-6)+(318-3)+318+(318+3)+(318+6)

  =318×5

  =1590

2.四年级下册数学简便运算练习题及答案 篇二

  1、1+2+3+4+5+6+7+8+9+10

  =(1+10)×10÷2

  =55

  2、1+2+3+4+5+……+20

  =(1+20)×20÷2

  =210

  3、1+2+3+4+……+99+100

  =(1+100)×100÷2

  =5050

3.四年级下册数学简便运算练习题及答案 篇三

  1)599996+49997+3998+407+89

  =600000+50000+4000-4-3-2+407+89

  =65400+487

  =65887

  2)(48×75×81)÷(24×25×27)

  =48×75×81÷24÷25÷27

  =48÷24×75÷25×81÷27

  =2×3×3

  =18

  3)48+50+52+54+56+58+60+62

  =(48+62)×8÷2

  =440

4.四年级下册数学简便运算练习题及答案 篇四

  1)345345÷15015

  =345×1001÷(15×1001)

  =345÷15×1001÷1001

  =23

  2)347+358+352+349

  =350×4-3+8+2-1

  =1400+6

  =1406

  3)75×45+17×25

  =25×3×45+17×25

  =25×(135+17)

  =25×152

  =25×4×38

  =3800

5.四年级下册数学简便运算练习题及答案 篇五

  1)654321×909090+654321×90909

  =654321×999999

  =654321×(100000-1)

  =654321000000-654321

  =654320345679

  2)34×3535-35×3434

  =34×35×101-35×34×101

  =0

  3)27000÷125

  =27×1000÷125

  =27×8

  =216

6.四年级下册数学简便运算练习题及答案 篇六

  1)222222×999999

  =222222×(1000000-1)

  =222222000000-222222

  =222221777778

  2)333333×333333

  =111111×999999

  =111111×(1000000-1)

  =111111000000-111111

  =111110888889

  3)56000÷(14000÷16)

  =56000÷14000×16

  =4×16

  =64

7.四年级下册数学简便运算练习题及答案 篇七

  1)39600÷25

  =396×100÷25

  =396×4

  =1584

  2)67×21+18×21+85×79

  =21×(67+18)+85×79

  =21×85+85×79

  =85×(21+79)

  =8500

  3)321×81+321×19

  =321×(81+19)

  =32100

8.四年级下册数学简便运算练习题及答案 篇八

  1)150×40÷50

  =150÷50×40

  =3×40

  =120

  2)5600÷(25×7)

  =56×100÷25÷7

  =56÷7×100÷25

  =32

  3)210÷42×6

  =210÷7÷6×6

  =30

9.四年级下册数学简便运算练习题及答案 篇九

  1)13×99

  =13×(100-1)

  =1300-13

  =1287

  2)75000÷125÷15

  =75×1000÷125÷15

  =75÷15×1000÷125

  =5×8

  =40

  3)7900÷4÷25

  =7900÷(4×25)

  =79

10.四年级下册数学简便运算练习题及答案 篇十

  1)125×(17×8)×4

  =125×8×4×17

  =1000×68

  =68000

  2)375×480+6250×48

  =480×(375+625)

  =480000

  3)25×16×125

  =25×2×8×125

  =50000

1. 125 × (17 × 8) × 4 = 125×8×4×17 =1000×68 =68000

2. 375 × 480 + 6250 × 48 =480×(375+625)

3. 25 × 16 ×125 =25×2×8×125 =50000

4. 13 × 99 =13×(100-1) =1300-13 =1287

5. 75000 ÷ 125 ÷ 15 =75×1000÷125÷15 =75÷15×1000÷125 =5×8 =40

6. 7900 ÷ 4 ÷ 25 =7900÷(4×25) =79

7. 150 × 40 ÷ 50 =150÷50×40 =3×40 =120

8. 5600 ÷(25 ×7) =56×100÷25÷7 =56÷7×100÷25 =32

9. 210 ÷ 42 × 6 =210÷7÷6×6 =30

10. 39600 ÷ 25 =396×100÷25 =396×4 =1584

11. 67 × 21 +18 × 21 + 85 × 79 =21×(67+18)+85×79 =21×85+85×79 =85×(21+79) =8500

12. 321 × 81 + 321 × 19 =321×(81+19) =32100

15. 56000 ÷ (14000 ÷ 16) =56000÷14000×16 =4×16 =64

17. 34 × 3535 -35 × 3434 =34×35×101-35×34×101 =0

18. 27000 ÷ 125 =27×1000÷125 =27×8 =216

20. 347 + 358 + 352 + 349 =350×4-3+8+2-1 =1400+6 =1406

21. 75 × 45 + 17 × 25 =65400+487 =65887

23. (48 × 75 ×81)×((24 ×

1)125 ×(17 × 8)× 4

= 125×8×4×17

=1000×68

=68000

2)375 × 480 + 6250 × 48

=480×(375+625)

3)25 × 16 ×125

=25×2×8×125

=50000

4)13 × 99

=13×(100-1)

=1300-13

=1287

5)75000 ÷ 125 ÷ 15

=75×1000÷125÷15

=75÷15×1000÷125

=5×8

=40

6)7900 ÷ 4 ÷ 25

=7900÷(4×25)

=79

7)150 × 40 ÷ 50

=150÷50×40

=3×40

=120

8)5600 ÷(25 ×7)

=56×100÷25÷7

=56÷7×100÷25

=32

9)210 ÷ 42 × 6

=210÷7÷6×6

=30

10)39600 ÷ 25

=396×100÷25

=396×4

=1584

11)67 × 21 +18 × 21 + 85 × 79

=21×(67+18)+85×79

=21×85+85×79

=85×(21+79)

=8500

12)321 × 81 + 321 × 19

=321×(81+19)

=32100

15)56000 ÷ (14000 ÷ 16)

=56000÷14000×16

=4×16

=64

17)34 × 3535 -35 × 3434

=34×35×101-35×34×101

=0

18)27000 ÷ 125

=27×1000÷125

=27×8

=216

20)347 + 358 + 352 + 349

=350×4-3+8+2-1

=1400+6

=1406

21)75 × 45 + 17 × 25

=65400+487

=65887

23)(48 × 75 ×81)÷(24 × 25 × 27)

=48 × 75 ×81÷24÷25÷27

=48÷24×75÷25×81÷27

=2×3×3

=18




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