Mathematics by Age Restriction

Age Restriction

This page contains a set of links to mathematical exercises. They are ordered by age restriction. For each age, there are corresponding exercises grouped into separate categories. Expand the lists and see the proposed options for mathematical examples.

Recommended for children from five years old

Integer Examples

Beginner 1.1 ip

5+2=7

Beginner 2.1 ip

9-1=8

Beginner 3.1 ip

10-5=5

Step-by-step Tasks

1+1=2

1+3=4

3+3=6

1+0=1

7+1=8

4-2=2

6-3=3

6-1=5

8-1=7

8-2=6

7-3=4

Recommended for children from six years

Integer Examples

7+10=17

11-5=6

15-6=9

10-1-2=7

Step-by-step Tasks

5+2=7

6+3=9

8+2=10

4+8=12

4+6=10

9+5=14

4+7=11

0+6=6

6+6=12

7+1=8

2+3=5

4+6=10

8+2=10

9+7=16

6-2=4

6+10=16

7+10=17

5-4=1

8-5=3

10-3=7

13-2=11

10-1=9

14-6=8

15-7=8

13-3=10

17-8=9

20-8=12

19-9=10

15-10=5

19-10=9

Recommended for children from seven years

Integer Examples

5-3=2

12+14=26

67-9=58

28+52=80

18-1-5=12

10-(7+2)=1

Step-by-step Tasks

10+10=20

0+0=0

11-10=1

22+4=26

3+10=13

14+11=25

20+10=30

14+16=30

0+25=25

6+11=17

3+17=20

8-6=2

10-1=9

17-2=15

11-3=8

11-4=7

19-5=14

7-6=1

16-7=9

11-1=10

1×2=2

2×4=8

10×2=20

9÷1=9

Comparisons

Natural 1.1 ip

9 > 2

Natural 2.1 ip

10-0 > 2+2

Language Exercises

Russian Vocabulary 1.1

б рлога

Recommended for children from eight years

Integer Examples

12-9=3

2+5=7

705-207=498

20+703=723

21+20+36=77

18-(7+8)=3

11×4=44

92÷23=4

9×3=27

52+44=96

57-26=31

78-23=55

Step-by-step Tasks

2+8=10

28+2=30

8+13=21

2+9=11

80+0=80

39+11=50

7+0+10=17

20-8=12

21-17=4

12-9=3

3-0=3

37-17=20

50-10=40

3×1=3

10×2=20

4×7=28

10×1=10

1×5=5

7×5=35

10×2=20

6×2=12

8×6=48

3×7=21

1×6=6

5×2=10

1×8=8

8×10=80

4×9=36

0×9=0

10×2=20

10×2=20

14÷2=7

7÷1=7

27÷3=9

12÷3=4

12÷4=3

4÷4=1

45÷5=9

0÷5=0

5÷1=5

24÷6=4

18÷6=3

28÷7=4

70÷7=10

70÷7=10

0÷8=0

60÷6=10

45÷9=5

45÷5=9

30÷3=10

80÷10=8

Comparisons

5 > 1

42 > 11

91-12 > 16-2

9÷3 < 7×1

Equations

Linear 1.1 ip

4+x=6

Linear 2.1 ip

2×x=6

Language Exercises

Russian Vocabulary 1.2

г гант

Russian Vocabulary 2.1

вас лёк

Russian Vocabulary 3.1

наш л

English Vocabulary 1.1

tr e

English Vocabulary 2.1

m p

Lexicon 1.1

pot [blot]

Lexicon 2.1

pl yer [gambler]

Recommended for children from nine years

Integer Examples

84+(95-82)=97

936-41-35=860

76-(4+40)=32

35×2=70

28×19=532

618÷6=103

939÷3=313

20÷5×3=12

(18÷3)÷2=3

90÷3÷(3×2)=5

60÷9=6(6)

4488+3854=8342

3693-2393=1300

6648-1648=5000

27×4=108

28÷2=14

21÷7+66=69

26+14÷7+10=38

84÷7=12

38÷4=9(2)

Step-by-step Tasks

12×2=24

11×6=66

14×3=42

20×3=60

17×4=68

12×5=60

12×3=36

20×5=100

5×16=80

6×20=120

10×7=70

9×15=135

19×8=152

2×21=42

9×11=99

5×21=105

20×8=160

20×8=160

10×11=110

16÷2=8

0÷11=0

24÷3=8

2÷2=1

56÷4=14

75÷5=15

24÷6=4

32÷2=16

60÷30=2

60÷6=10

112÷7=16

72÷4=18

160÷8=20

25÷5=5

9÷9=1

98÷7=14

490÷10=49

7÷1=7

40÷5=8

Comparisons

27+6 > 4+2

852 > 850

671-177 = 980-486

26÷2 > 80÷10

Equations

Linear 1.2 ip

96-x=13

Linear 2.2 ip

72×x=72

Linear 3.1 ip

x×2+2=6

Language Exercises

Russian Vocabulary 1.3

обн вление

Russian Vocabulary 2.2

оранж вый

Russian Vocabulary 3.2

ж лезо

English Vocabulary 3.1

z ro

10+

Recommended for children from ten years

Integer Examples

764-108=656

71167+78833=150000

668531-18531=650000

123667+740701=864368

306+(286+124)=716

892÷4=223

77×52=4004

5600÷20=280

21×30=630

30×20÷24=25

(25×40)÷20=50

39÷13×(25×2)=150

238÷14=17

157000+281637=438637

820119-816514=3605

294903+350000=644903

8600×7=60200

1000×72=72000

760÷5=152

40÷10+69=73

900÷10-46=44

579-132÷6-56=501

92-(3+5)×9=20

395÷5=79

124÷18=6(16)

Comparisons

Natural 0.3 ip

630+105 > 131+200

Natural 1.4 ip

188319 < 188327

Natural 2.4 ip

624432-151195 < 677301+70597

Natural 3.3 ip

594÷27 < 776÷4

Equations

5×(x-7)=5

x+296=576

897÷x=299

78÷x-1=1

2×(1+x)=10

Rounding

Round 1.1 ip

509≈51

Round 1.2 ip

6281≈63

Round 2.1 ip

877-70≈81

Language Exercises

Russian Vocabulary 2.3

обн вление

English Vocabulary 1.2

range

English Vocabulary 2.2

mu t

Lexicon 1.2

re r [background]

Lexicon 2.2

wid [broad]

Infinitive 1.1

backslide backslid [backslide]

11+

Recommended for children from the age of eleven

Integer Examples

Beginner 0.5 ip

783110+162887-150397=795600

Beginner 4.5 ip

354281+581405-260651=675035

Beginner 5.5 ip

164557+(680688-405731)=439514

7-7=0

522813-313961=208852

-10+7-7=-10

30×86=2580

5×15×32=2400

31×(60×2)=3720

4×3×(23×11)=3036

882÷10=88(2)

2250×908=2043000

7826÷13=602

451×2-76÷19=898

4704÷28+2280÷760=171

9108÷12-59=700

60×38+91×594=56334

(57+103)÷(770-754)=10

Numeracy 3.3 ip

(598-570)×(21+22)=1204

Divisor_ENG 1.3 ip

8897÷31=287

Remainder_ENG 1.3 ip

318÷20=15(18)

Decimal Examples

9.7-7.2+4.1=6.6

38.6-18.2=20.4

1.2+1.8=3

6+77.9=83.9

2-1.7+8=8.3

58.5+95.5-75.6=78.4

4.2-(8.9-6)=1.3

65.9-(42.6-2)=25.3

30.6÷8.5=3.6

7×3.6=25.2

39.6÷0.8=49.5

20.4÷3.4=6

Divisional_ENG 1.1 dp

35.2÷8.8=4

Fraction Examples

Numerator 1.1 fp

2/3-2/3=0/1

Comparisons

Natural 0.4 ip

18469+181531 > 15000+34092

114×7 > 3×4

-3 < 7

-5 > -6

2-4 < 7+3

2×(-5) < 4×(-2)

33.6 < 91.3

85.7-74.3 < 11+2.2

8/9 > 1/6

361/37 = 361/37

3/5-2/5 < 1/4+1/4

Equations

60+x×9=96

93×x=651

971-58×x=159

56÷(x+1)=7

(5+x)×148=740

-x+10=2

-x×(-9)=-9

Rounding

13.2≈13

92.4-11.3≈81

986-19≈97

8118-2053≈61

250235≈250

809804≈810

5800-2094≈37

480880-1191≈480

5×43≈22

358×25≈90

737856÷122≈6

Language Exercises

Russian Vocabulary 1.4

ори нтир

Russian Vocabulary 3.3

прис гать

English Vocabulary 1.3

th rteen

English Vocabulary 2.3

contin e

English Vocabulary 3.2

n nth

Lexicon 1.3

dis olve [melt]

Infinitive 2.1

outrode [outride]

12+

Recommended for children from the age of twelve

Integer Examples

-3-(-6+4)=-1

-(1-0)-(1-7)=5

72-76=-4

-12+12=0

90-20=70

15+8-4=19

-7+14-37=-30

-3+(-4-1)=-8

-10-(-3-6)=-1

33+(-37+1)=-3

-(10+10)+(4+9)=-7

-(12+10)+(16+5)=-1

(93-0)+(11-60)=44

505×408=206040

955×464=443120

676804÷148=4573

155×982=152210

659×80×10=527200

(250000÷5)÷250=200

200×38÷(190×4)=10

7734×7000=54138000

49987÷37=1351

-33+6÷2=-30

-29-24÷12=-31

23+24÷4+41=70

(6-66)÷(-2-4)=10

2×25÷(10÷2)=10

-7×8=-56

4×2×8=64

(60÷4)×(-2)=-30

64÷(-2×4)÷4=-2

73374÷21=3494

Decimal Examples

Partitive 0.3 dp

18.26+(63.2-7.85)=73.61

Partitive 1.3 dp

96.8-20=76.8

Partitive 2.3 dp

77.66-41.09+38.06=74.63

Partitive 3.3 dp

38.26-(94.55-82.63)=26.34

2-9.3=-7.3

-65.5-19.4=-84.9

-2.9+3.1=0.2

16.7+5=21.7

-2.6+1.9-7.3=-8

0.3-88.7+77.4=-11

5.2-(8+1.7)=-4.5

-40.3-(8.8+4)=-53.1

27÷2=13.5

2.16÷2=1.08

1.2÷2=0.6

1.25×2.52=3.15

3.84÷4.8=0.8

1.92×1.25=2.4

93.6÷19.5÷16=0.3

72÷(4.5×6.4)=2.5

63.8-1.6×2.5÷5=63

1.2-0.5×0.4=1

17.6÷4+4×1.7=11.2

(71.1-69.6)×(58.4-24.8)=50.4

Negatory 1.1 dn

32÷2.5-25=-12.2

Negatory 2.1 dn

58+8÷2.5÷2=59.6

Residual_ENG 1.1 dp

69÷2=34.5

Divisional_ENG 1.2 dp

62.4÷13=4.8

Fraction Examples

Numerator 0.1 fp

4/9+2/9+1/6=5/6

Numerator 0.2 fp

183/19-(2/3+25/3)=12/19

7/6+23/78=19/13

3/5+1/5+1/10=9/10

7/16+1/16+29/10=17/5

1/6+(1/6+4/9)=7/9

491/60-(821/100-43/50)=5/6

-1/8+(-1/8-1/8)=-3/8

-3/8+3/4=3/8

2/9-2/9-1/3=-1/3

-1/2+(1/2+1/2)=1/2

3/5×7/3=7/5

3/13×1456/33=112/11

3/5×10/9÷6/5=5/9

10/16=5/8

828/24=69/2

47/5-2/3÷20/9=91/10

Comparisons

2×20 > 72÷3

-735 < 706

43 > 16

-139 = -139

-45-5 < -40-9

169+616 < -50+994

66÷(-6) > 25×(-4)

-7×30 < -860÷(-4)

16.2 < 16.3

35.52÷2.96 = 12.96÷1.08

80.2 > 13.27

42.354 < 42.371

950.553 > 56.38

2.79+2.8 < 65.46-45.46

Point 2.3 dp

6.675+59.134 > 89-23.199

87÷5.8 > 0.5×20.8

85÷17 < 90.09÷6.93

-47.3 < 47.4

-54.66 < 6

-66.5 < 30.1

87.32 > 87.31

-91+96.7 > -10.7-9.2

-9.58-32.98 < -60+48.42

Doted 3.1 dn

1.1×(-14) = 77÷(-5)

Doted 3.2 dn

71.5÷(-1.3) < 58.25÷2.33

Improper 0.1 fp

1/5 < 7/10

Improper 0.2 fp

86/9÷79/81 > 23/6×30/23

Improper 1.3 fp

2616/43 > 411/11

Improper 2.2 fp

5/2-185/98 < 2/3+4/3

Improper 2.3 fp

23/627+4/627 < 577/68+2929/340

Improper 3.1 fp

1/2×1/3 < 1/2×4/9

Improper 3.2 fp

3/46×4/3 < 385/46×31/55

Descent 1.1 fn

-6/7 < 2/5

Descent 1.2 fn

485/62 < 279/34

Descent 2.1 fn

-1/2-1/2 < -2/5-1/10

Equations

3×(-x-8)=0

x×2+68=-10

68-x=-2

-x-561=409

-2×x=-84

-980÷x=-28

1-x÷5=0

x÷10+1=-1

-8÷(-x+4)=-2

-18×(-44+x)=-36

Rounding

8.9+70.8≈80

60.42-5.14≈55.3

99.06≈99.1

24.999≈25

52.06+0.95≈53

79.659-59.158≈20.5

93.3÷28≈3

1.61×48.93≈78.8

Language Exercises

Russian Vocabulary 2.4

мит нг

English Vocabulary 3.3

cl mbing

Lexicon 2.3

f shing [piscatorial]

Infinitive 1.2

overshoot overshot [overshoot]

Infinitive 3.1

feed [feed]

13+

Recommended for adolescents from the age of thirteen

Integer Examples

Conversant 0.4 in

-(2+338)+(202-832)=-970

Conversant 0.5 in

-838313+779082=-59231

Conversant 1.4 in

662-617=45

Conversant 2.4 in

310-770+758=298

Conversant 2.5 in

-453879-161703+35582=-580000

Conversant 3.4 in

-821-(-206+65)=-680

Conversant 3.5 in

181625-(-153365-643000)=977990

Conversant 4.4 in

-(695-404)+(581-440)=-150

Conversant 4.5 in

-(391946+433469)+(772757-500569)=-553227

20000÷100=200

-295-56×44÷11=-519

450÷30+259=274

159+4×6+181=364

153-(510-474)÷4=144

320÷(16÷2)÷10=4

24÷(-3)=-8

50÷10×40=200

-2×(-33×(-10))=-660

-720÷(-36÷3)÷15=4

3352043÷391=8573

Decimal Examples

Partitive 0.4 dp

565.197+232.946=798.143

Partitive 1.4 dp

359.879+246.465=606.344

Partitive 2.4 dp

509.214-310.291+180.124=379.047

Partitive 3.4 dp

370.145-(486.9-421.938)=305.183

-47+23+77.37=53.37

140+90=230

15.99-2.66=13.33

-112.271+452.92=340.649

Split 2.3 dn

-73.8-66+93.62=-46.18

Split 2.4 dn

448.696-466.3+31.2=13.596

Split 3.3 dn

20-(-24.4-29)=73.4

Split 3.4 dn

-61+(-301.573-215.315)=-577.888

50÷20=2.5

10.368÷32=0.324

17.28÷28.8=0.6

(35.858÷17.929)×0.002=0.004

1.25×2.4=3

2.124÷2.4=0.885

4.05×0.2=0.81

43.75×0.24÷7.5=1.4

4.8×6.5×2.25=70.2

4.32÷(0.72×60)=0.1

1.2÷(100÷2)=0.024

30-0.5×2.4+25.46=54.26

Definition 1.2 dp

29.2-2.72÷13.6=29

Definition 1.3 dp

36.9×2.71-1.499=98.5

Definition 2.2 dp

51.25+0.6×0.2-2.37=49

Definition 2.3 dp

19.344+5.76÷48+25.693=45.157

Definition 3.2 dp

96.55-(15.73-14.45)×16.25=75.75

Negatory 0.1 dn

60÷(-0.5-0.3)÷50=-1.5

Negatory 0.2 dn

82.5÷(0.93+5.32)×4.5=59.4

Negatory 1.2 dn

-2.6+7×0.8=3

Negatory 1.3 dn

-30.444+0.792×64=20.244

Negatory 2.2 dn

67.32+1.44×10÷2.5=73.08

Negatory 2.3 dn

-4.788÷0.672+1.44÷22.5=-7.061

Negatory 3.1 dn

-41.4-81÷(6.4+9.8)=-46.4

Negatory 3.2 dn

4.62-(79.8-94.8)×0.32=9.42

Residual_ENG 1.2 dp

90÷5=18

Divisional_ENG 1.3 dp

3.96÷5=0.792

Fraction Examples

Numerator 0.3 fp

3/11+8403/869=8640/869

Numerator 1.3 fp

53/13+77/13=10/1

Numerator 2.3 fp

21/10+549/10-5991/488=21825/488

Numerator 3.3 fp

113/2-(121/2-8280/197)=7492/197

1/6-13/6=-2/1

23/9+31/9=6/1

41/390+17/78=21/65

5/62+49/62+159/31=6/1

Denominator 3.2 fn

71/95-(-1/5-269/38)=305/38

1/2÷1/5÷9/2=5/9

119/11÷1547/33=3/13

1/5×408/5=408/25

7/2÷11/6×155/21=155/11

Fragment 2.3 fp

10/19×627/10×262/99=262/3

Fragment 3.1 fp

(1/2÷3/2)÷3/8=8/9

Fragment 3.2 fp

119/24×(4/9×108/7)=34/1

1050/30=35/1

35/4×2/5-17/8=11/8

95/3÷19/28-29/3=37/1

(3/8+1/8)÷2/3=3/4

-(1/2+1/10)×7/6=-7/10

Complete 1.1 fn

9/2-1/3×9/2=3/1

Complete 1.2 fn

-7/8×1308/49+473/21=-5/6

Complete 2.1 fn

(-48/5-2/5)×1/10=-1/1

Comparisons

Ceil 0.4 in

-40508-3990 > -49120-145350

Ceil 1.4 in

-809034 < 652031

Ceil 2.4 in

150146+91754 > 467574-711419

Ceil 3.4 in

46×(-99) = -396198÷87

Point 0.3 dp

70.062-9.497 > 27.029+9.946

Point 0.4 dp

799.414 > 530.701

Point 2.4 dp

860.973-709.01 < 129.424+22.543

Point 3.3 dp

0.75×29.44 < 18.785×4.8

Point 3.4 dp

363.24÷3.027 < 2.41×49.8

Doted 0.3 dn

-6.4×3.125 < -32.14÷(-1.607)

Doted 1.3 dn

-77.522 < -77.515

Doted 1.4 dn

310 > -487.701

Doted 2.3 dn

-5.166-52.58 < 37.929+11.949

Doted 2.4 dn

-48.534-207.959 < -140.37-116.115

Doted 3.3 dn

82.08÷(-1.44) < 65.61÷(-6.561)

Improper 0.3 fp

4393/57-69871/912 < 13/35+50237/665

Improper 3.3 fp

77/96÷1771/636 < 47/66×4482/47

Descent 0.1 fn

3/4+1/4 = 3/4+1/4

Descent 0.2 fn

-1/62-411/62 < 9/2-37/8

Descent 1.3 fn

-23541/257 < -13629/257

Descent 2.2 fn

5/1-284/65 > -1/3-1/15

Descent 3.1 fn

-4/5×5/6 < 1/10÷(-2/5)

Descent 3.2 fn

2/1÷(-37/42) < -16/3×15/64

Equations

-x+940=350

-99×x-990=0

48×(x-769)=-624

x+y=14

Rounding

Rounding 0.3 dp

38.306-18.454≈19.85

Rounding 3.3 dp

27.479×2.6≈71.45

Language Exercises

Russian Vocabulary 1.5

дъюнкт

Russian Vocabulary 3.4

на зусть

English Vocabulary 1.4

rema ning

English Vocabulary 2.4

men ion

Lexicon 1.4

poi onous [noxious]

Infinitive 2.2

underwrite [underwrite]

14+

Recommended for adolescents from the age of fourteen

Integer Examples

Intellect 0.3 in

-5067-264÷88=-5070

Intellect 1.3 in

140+2304÷24=236

Intellect 2.3 in

29600+1200×54÷27=32000

Intellect 3.3 in

(-2300-35200)÷(6582-6585)=12500

25×(-19)=-475

-50×(-93)=4650

-3×(-250)÷(-50)=-15

(50÷(-25))×(-250)=500

Logics 4.3 in

147×35÷(-7×(-7))=105

Decimal Examples

9÷24=0.375

167.552÷152.32=1.1

8.1×27.2=220.32

15.288÷3=5.096

2.4×12.09=29.016

194.4÷64.8÷4.8=0.625

(810÷28.125)×0.25=7.2

Definition 0.3 dp

42.84÷4.284+20.586=30.586

Definition 0.4 dp

774.02-200÷62.5=770.82

Definition 1.4 dp

867.991-24÷15.625=866.455

Definition 2.4 dp

589.171+0.9÷36×490=601.421

Definition 3.3 dp

40.04-(2.006+1.354)÷84=40

Definition 3.4 dp

366.636-(331.677-25.437)÷51.04=360.636

Negatory 0.3 dn

-0.78×54+58.046=15.926

Negatory 0.4 dn

-550.135+500÷15.625=-518.135

Negatory 1.4 dn

673.92÷6.5+124.249=227.929

Negatory 2.4 dn

-27.36÷684-2.7÷37.5=-0.112

Negatory 3.3 dn

(-9.304-1.1)÷(-20-31)=0.204

Negatory 3.4 dn

(11.044+1.756)×(-51.194-11.306)=-800

Residual_ENG 1.3 dp

11÷88=0.125

Fraction Examples

Denominator 0.3 fn

-23984/369-(-28/41-23486/369)=-2/3

Denominator 2.3 fn

-36/85-23/170-43023/646=-1276/19

Denominator 3.3 fn

-2081/47+(91/423+53773/846)=39/2

Fragment 0.3 fp

162/5×(404/19÷1616/19)=81/10

Fragment 3.3 fp

13/58÷(19/2×1/19)=13/29

Limited 0.2 fp

158/51×(6/5+37/40)=79/12

Limited 1.3 fp

387/11+1/4×564/11=48/1

Limited 2.2 fp

255/11×(25/34-3/34)=15/1

Complete 0.2 fn

-5/57+153/19÷459/44=13/19

Complete 1.3 fn

82757/979+141/4÷1551/28=7580/89

Complete 2.2 fn

(3/8+69/8)×1/9=1/1

Comparisons

Doted 0.4 dn

599.73÷30 > 578.772÷46

Doted 3.4 dn

-17.64×16 < 12.5×(-20)

Descent 0.3 fn

-817/379+99/1 > -1/2-961/10

Descent 2.3 fn

56608/835-56723/835 > -1/11-10/11

Descent 3.3 fn

-14/3÷721/150 < 514/7×(-7/771)

Equations

4x²=64

6x²=216

-x²-x=0

x²-8x+12=0

4y+9x=113

x+y=105

720x÷3y=800

10x+4y=140

2x+6y=12

y+x=-1

-20y÷5x=1

10y+4x=128

Language Exercises

Russian Vocabulary 2.5

перп ндикуляр

English Vocabulary 1.5

respons bility

English Vocabulary 2.5

artifi ially

English Vocabulary 3.4

equ valent

Lexicon 1.5

comm nicate [give]

Lexicon 2.4

wo nded [injured]

Infinitive 1.3

underspend underspent [underspend]

Infinitive 3.2

sat [sit]

15+

Recommended for adolescents from the age of fifteen

Integer Examples

500×(-200)÷800=-125

-3960÷88=-45

-63×(-159)×41=410697

1080÷(-180÷60)=-360

364800÷(-20)÷(12×(-40))=38

Fraction Examples

Limited 0.3 fp

1/3×7/3-1/36=3/4

Limited 2.3 fp

(47/128+1/128)÷3/536=67/1

Complete 0.3 fn

(1/2-9/2)×79/854=-158/427

Complete 2.3 fn

(159/10+4293/70)×353/901=1059/35

Equations

7x²=15463

30x²=60750

-61x²-1220x=0

-x²-76x-960=0

x-y=20

y-x=118

140y÷30x=35

55y+44x=6490

y-x=43

y-x=-100

-260x÷2y=-871

-33x-5y=-2830

Language Exercises

Russian Vocabulary 3.5

ц линдр

English Vocabulary 3.5

interr ption

Lexicon 2.5

ind pendence [liberty]

Infinitive 2.3

light [light]

16+

Recommended for adolescents from the age of fifteen

Equations

876x²-876000x=0

117x²=4916925

-370x²-335590x=0

-9x²-72x-144=0

x+y=800

11y×2x=5017320

76y+44x=86172

-x-y=236

y-x=-205

-2x×8y=-3008000

-53y-683x=65307

Language Exercises

Infinitive 3.3

forgo [forgo]

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