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

3+5=8

Beginner 2.1 ip

9-5=4

Beginner 3.1 ip

10-5=5

Step-by-step Tasks

3+1=4

1+2=3

3+3=6

1+3=4

3+1=4

2-1=1

5-2=3

3-2=1

8-1=7

6-2=4

3-3=0

Recommended for children from six years

Integer Examples

7+2=9

3-1=2

9+0=9

4+6-1=9

Step-by-step Tasks

8+2=10

6+3=9

1+0=1

4+1=5

3-3=0

5+9=14

7+5=12

2+6=8

4+5=9

5+7=12

2+3=5

4+2=6

9+8=17

9+8=17

5-4=1

10+9=19

7+10=17

10-4=6

6-5=1

9-2=7

13-2=11

5-2=3

14-6=8

16-7=9

1-1=0

14-8=6

11-5=6

10-9=1

0-0=0

10-10=0

Recommended for children from seven years

Integer Examples

7-3=4

20+33=53

91-27=64

58+32=90

6+8-2=12

9-(2+6)=1

Step-by-step Tasks

13+5=18

15+10=25

10-10=0

11+2=13

13+23=36

12+4=16

20+10=30

14+16=30

5+25=30

6+11=17

5+27=32

14-9=5

5-1=4

14-2=12

19-13=6

24-14=10

19-5=14

7-6=1

27-17=10

16-6=10

1×6=6

2×6=12

1×1=1

4÷1=4

Comparisons

Natural 1.1 ip

2 > 0

Natural 2.1 ip

10-0 > 2+2

Language Exercises

Russian Vocabulary 1.1

ч ловек

Recommended for children from eight years

Integer Examples

14-(2+12)=0

98+92=190

810-176=634

968-658=310

81-6-22=53

18-(7+8)=3

5×3=15

0÷4=0

30÷10=3

45+13=58

78-15=63

20+60=80

Step-by-step Tasks

2+8=10

27-22=5

18+0=18

2+9=11

80+0=80

10+25=35

1+4+3=8

19-18=1

24-14=10

19-9=10

11-7=4

20-0=20

100-60=40

3×5=15

1×2=2

4×10=40

4×7=28

1×5=5

5×7=35

2×5=10

1×6=6

9×6=54

7×9=63

1×6=6

7×10=70

8×6=48

5×0=0

10×9=90

9×9=81

5×8=40

10×4=40

12÷2=6

16÷2=8

18÷3=6

12÷3=4

40÷4=10

6÷1=6

45÷5=9

0÷5=0

10÷1=10

48÷6=8

40÷5=8

21÷7=3

24÷6=4

5÷1=5

48÷8=6

0÷8=0

36÷9=4

80÷8=10

80÷2=40

30÷10=3

Comparisons

7-4 > 1+0

31 > 18

30+0 > 21+0

9÷3 < 4×1

Equations

Linear 1.1 ip

7-x=4

Linear 2.1 ip

6÷x=2

Language Exercises

Russian Vocabulary 1.2

з бавы

Russian Vocabulary 2.1

б тон

Russian Vocabulary 3.1

щ гол

English Vocabulary 1.1

h ve

English Vocabulary 2.1

on y

Lexicon 1.1

tak [accept]

Lexicon 2.1

w rd [say]

Recommended for children from nine years

Integer Examples

65-(24+8)=33

936-41-35=860

97-(5+60)=32

8÷2=4

28×12=336

648÷4=162

38×24=912

10×9÷5=18

100÷(4×5)=5

5×2×(6÷3)=20

26÷3=8(2)

2422+7578=10000

2694-2070=624

6041-3545=2496

48×4=192

30÷6=5

68÷34+68=70

58+45÷3-43=30

98÷7=14

20÷7=2(6)

Step-by-step Tasks

2×17=34

4×11=44

3×11=33

45×2=90

12×4=48

15×5=75

12×3=36

20×5=100

8×5=40

6×18=108

10×7=70

5×6=30

11×8=88

39×2=78

20×9=180

6×14=84

10×16=160

30×6=180

7×8=56

34÷2=17

22÷11=2

24÷3=8

48÷3=16

56÷4=14

70÷5=14

16÷2=8

54÷3=18

90÷30=3

60÷6=10

112÷7=16

66÷6=11

32÷8=4

15÷5=3

45÷9=5

98÷7=14

420÷20=21

108÷9=12

55÷11=5

Comparisons

3×3 < 72÷3

732 > 596

978-169 > 283-263

8×6 < 100÷2

Equations

Linear 1.2 ip

x-40=20

Linear 2.2 ip

40÷x=4

Linear 3.1 ip

x×2+2=6

Language Exercises

Russian Vocabulary 1.3

п стух

Russian Vocabulary 2.2

дежда

Russian Vocabulary 3.2

д ревня

English Vocabulary 3.1

w lk

10+

Recommended for children from ten years

Integer Examples

786-406=380

141211+55934=197145

993679-793679=200000

126529+74200=200729

203+(86+232)=521

588÷7=84

36×30=1080

2826÷18=157

3000÷3=1000

420÷10×12=504

40×(2×2)=160

10÷(5×2)×20=20

134÷12=11(2)

242327+357673=600000

949800-642000=307800

457348-227348=230000

1625×8=13000

3350×60=201000

928÷2=464

92÷2-34=12

900÷10-46=44

260÷2-10×4=90

(37+23)÷(58-48)=6

984÷2=492

189÷14=13(7)

Comparisons

Natural 0.3 ip

920÷10 < 12×8

Natural 1.4 ip

796100 > 715403

Natural 2.4 ip

978592-119645 > 300438-238438

Natural 3.3 ip

790÷10 < 2×100

Equations

3+1×x=8

x-262=38

x×200=1000

x÷5-3=2

7÷(x-1)=7

Rounding

Round 1.1 ip

802≈80

Round 1.2 ip

7036≈70

Round 2.1 ip

723-44≈68

Language Exercises

Russian Vocabulary 2.3

обн вление

English Vocabulary 1.2

s ear

English Vocabulary 2.2

som

Lexicon 1.2

s fely [securely]

Lexicon 2.2

range [fruit]

Infinitive 1.1

undersell undersold [undersell]

11+

Recommended for children from the age of eleven

Integer Examples

Beginner 0.5 ip

900000-320000=580000

Beginner 4.5 ip

830000-419071+290692=701621

Beginner 5.5 ip

291757+(668981-380000)=580738

0-3=-3

47000-651290=-604290

-3-1-5=-9

14×42=588

23×39×3=2691

720÷(12×2)=30

3520÷(2×2)÷40=22

911÷30=30(11)

20000×467=9340000

7033÷13=541

629+42÷6=636

7600-10×500=2600

6000+80×175=20000

584×95-1280÷128=55470

Numeracy 3.2 ip

(30+17)×(210-195)=705

Numeracy 3.3 ip

6428-(5842-5678)×27=2000

Divisor_ENG 1.3 ip

8897÷31=287

Remainder_ENG 1.3 ip

480÷69=6(66)

Decimal Examples

0+(4.7+0.8)=5.5

9.2+(87.1-39.2)=57.1

0.1+7=7.1

2.2+14=16.2

8.4-1.2-2.2=5

58.5+95.5-75.6=78.4

4.6-(1.4+0.6)=2.6

15.9+(5.7+32)=53.6

1.1÷0.2=5.5

0.8×42.5=34

96÷1.5=64

1.8×5=9

Divisional_ENG 1.1 dp

45÷3.6=12.5

Fraction Examples

Numerator 1.1 fp

2/3-2/3=0/1

Comparisons

Natural 0.4 ip

300830+407403 < 880295-31818

104×17 < 25×72

5+5 > 8-10

-5 > -6

4+5 < 6+4

2×2 > 9÷3

20.7 < 34.8

98.1-22.4 < 84.4-5.9

1/8 < 1/4

347/67 > 4/5

1/6+1/6 < 1/3+2/3

Equations

48÷x-1=1

741÷x=39

96-x÷2=43

56÷(x+1)=7

120×(x-864)=720

-1-x=6

x÷(-7)=-1

Rounding

48.1≈48

19.1-18.1≈1

97+168≈27

4126≈41

535855≈536

244144≈244

1780+667≈24

945024-244674≈700

988÷13≈8

1117×5≈56

8969×52≈466

Language Exercises

Russian Vocabulary 1.4

ор ентация

Russian Vocabulary 3.3

исч зать

English Vocabulary 1.3

ho n

English Vocabulary 2.3

de erted

English Vocabulary 3.2

alo e

Lexicon 1.3

tr ding [commerce]

Infinitive 2.1

quick-freeze [quick-freeze]

12+

Recommended for children from the age of twelve

Integer Examples

-(1-10)+(4-10)=3

-13+(20-10)=-3

-73-(90-81)=-82

-20+3=-17

-10-10=-20

2+11-14=-1

32-100-21=-89

0-(-4-1)=5

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

17-(90+20)=-93

-(0-7)-(6+6)=-5

(19-17)-(1+13)=-12

-(100-100)-(49-19)=-30

Cognizant 0.4 ip

10720÷(62042÷926)×25=4000

741×1000=741000

689850÷7=98550

125×40=5000

95040÷96÷11=90

(500÷2)×40=10000

36300÷(10×11)÷11=30

65000×1499=97435000

22400÷32=700

72+36×2÷4=90

73-6×22=-59

57÷3+2×10=39

-60+20÷(17-15)=-50

80÷(-5)=-16

57÷(-3)=-19

-9×(-2)×2=36

(-80÷(-2))÷(-4)=-10

-4×(2×6)÷3=-16

31739÷17=1867

Decimal Examples

38.43-34.77=3.66

62.72-32.71=30.01

70-58+33=45

96.35-(20+10)=66.35

-5.2-1.6=-6.8

-12-(1.3+16.1)=-29.4

-8.9-1.1=-10

-84-14.4=-98.4

4.7+6.9-9.7=1.9

-30.6-32+9.6=-53

7.3-(9-6)=4.3

-58.1+(-80.4+49.4)=-89.1

33÷5=6.6

6.4÷32=0.2

8.7÷1.5=5.8

2.2×1.05=2.31

1.44÷7.2=0.2

5.6×0.05=0.28

27×2×0.1=5.4

1.6×(5×0.1)=0.8

6×(66.9-51.8)÷6=15.1

3.5×1.6+27.1=32.7

54+0.5×2.6+2.9=58.2

12-6.8÷(85.7-77.2)=11.2

Negatory 1.1 dn

6×1.8+1.4=12.2

Negatory 2.1 dn

58+8÷2.5÷2=59.6

Residual_ENG 1.1 dp

57÷3=19

Divisional_ENG 1.2 dp

12÷3.2=3.75

Fraction Examples

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

5/6+25/6-33/8=7/8

157/18-83/14=176/63

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

119/87+484/87-201/29=0/1

Numerator 3.1 fp

1/2+(1/2-1/3)=2/3

Numerator 3.2 fp

24/17-(1/5+18/85)=1/1

1/3+2/3-2/3=1/3

2/3+1/3=1/1

-1/10-1/10-1/5=-2/5

1/3+(1/6+1/2)=1/1

3/4×68/7=51/7

92/7÷460/21=3/5

3/2×1/3÷9/8=4/9

10/16=5/8

3231/129=1077/43

3/5+1/2÷5/6=6/5

Comparisons

-45×2 < -44÷2

873 > -188

30 < 100

-892 < -756

18+43 > -28+57

860-7 > 134-553

-7×(-13) > -50÷5

892÷(-4) < 369÷(-3)

13+55.3 > 45-1.4

65.77 > 45.17

34.01 < 35.79

42.354 < 42.371

210.97 > 155.721

98.73-1.14 > 7.39+0.53

Point 2.3 dp

46.766+8.23 < 97.161-7.524

4.5×2.8 > 1.5×3.4

1.6×11.25 < 81÷4.05

9.2×(-7.5) > -24×3.2

-97.85÷1.03 < 95.04÷(-3.52)

37.3 > 20

82.65 > -97.27

-49-1 < -31.6+75.9

35.88-2.98 < 74.36+12.64

Doted 3.1 dn

1.5×16.8 > -2.5×(-8)

Doted 3.2 dn

-95.76÷(-23.94) = -43.4÷(-10.85)

Improper 0.1 fp

1/5+3/5 > 7/10-1/10

Improper 0.2 fp

86/9÷79/81 > 23/6×30/23

Improper 1.3 fp

92/397 < 8/11

Improper 2.2 fp

163/29-97/29 < 181/19-126/95

Improper 2.3 fp

3168/421+5593/421 > 1/10+1/90

1/4÷2/3 = 1/4÷2/3

2/3×95/32 > 5/2×1/5

-3/4 < 1/5

-5/1 < 1/2

-1/5-3/10 < 2/3-1/3

Equations

x×3=3

10÷(-7-x)=5

-x+12=-52

x-914=-255

x×(-8)=-80

-42×x=-420

-3-x÷5=-5

52+94÷x=54

6÷(-x+9)=3

-5×(-61-x)=0

Rounding

80.9-15.9≈65

19.91÷5≈4

50.35≈50.4

0.771≈0.77

42.03-2.91≈39.1

29.431-25.435≈4

68.8÷3≈23

75×0.2≈15

Language Exercises

Russian Vocabulary 2.4

э спрессия

English Vocabulary 3.3

pi l

Lexicon 2.3

attac [join]

Infinitive 1.2

bleed bled [bleed]

Infinitive 3.1

bust [bust]

13+

Recommended for adolescents from the age of thirteen

Integer Examples

-648+838=190

629575-632768=-3193

-493+602=109

310-770+758=298

278000-101822+61000=237178

Conversant 3.4 in

-229-(346+83)=-658

Conversant 3.5 in

866806+(-785762+337452)=418496

Conversant 4.4 in

-(92-67)+(152+426)=553

Conversant 4.5 in

(153170+29689)+(606039-878898)=-90000

900000÷500=1800

-48×19+30×42=348

11+22÷2=22

-319+377×3-572=240

(-60-75)÷(15+12)=-5

-210÷(6÷(-3))=105

-10×(-20)=200

14×2×(-10)=-280

-350÷(-70÷14)=70

-560÷(-4÷(-2))÷(-20)=14

Divisor_ENG 1.5 ip

1962083÷379=5177

Decimal Examples

Partitive 0.4 dp

455.8-339.8=116

Partitive 1.4 dp

359.879+246.465=606.344

Partitive 2.4 dp

590-111.573-328.427=150

Partitive 3.4 dp

237.038+(265.417+175.545)=678

Split 0.3 dn

-87.46+(-90+98.79)=-78.67

Split 0.4 dn

119.87-341.97+409.266=187.166

Split 1.3 dn

67.28+22.69=89.97

Split 1.4 dn

-10.495-147.571=-158.066

Split 2.3 dn

0.05-45.9-49.15=-95

Split 2.4 dn

-93.725-75+140.922=-27.803

Split 3.3 dn

-96.68-(60.52-98.2)=-59

Split 3.4 dn

-160-(170.28+536.543)=-866.823

99÷30=3.3

0.009÷0.09=0.1

3.75×0.04=0.15

(1.536÷38.4)÷1.25=0.032

0.64×0.1=0.064

1.68÷0.56=3

3.432÷1.716=2

1.1×2.4÷3=0.88

1.344÷0.525÷6.4=0.4

(1.5×0.8)÷8=0.15

0.022×(62.5×0.032)=0.044

Definition 0.2 dp

6.88×5+1.04×15=50

Definition 1.2 dp

0.5×5+45.5=48

Definition 1.3 dp

37.8÷0.8-44.988=2.262

Definition 2.2 dp

34.72-0.98×4×1.25=29.82

Definition 2.3 dp

44.236-34.56÷22.5÷1.2=42.956

Definition 3.2 dp

(0.83+1.17)×(41.3-34.81)=12.98

Negatory 0.1 dn

-2÷0.8+1.5×4=3.5

Negatory 0.2 dn

54.96-2.7÷10×30=46.86

Negatory 1.2 dn

-23.04÷72-89.74=-90.06

Negatory 1.3 dn

-1.25×2.24-37.2=-40

Negatory 2.2 dn

-0.98÷2.45-15.68÷98=-0.56

Negatory 2.3 dn

28.743-5.1÷20+61.512=90

Negatory 3.1 dn

82.8-(93-28)÷32.5=80.8

Negatory 3.2 dn

(0.5+0.78)×(-4.33-6.67)=-14.08

Residual_ENG 1.2 dp

100÷25=4

Divisional_ENG 1.3 dp

0.234÷6=0.039

Fraction Examples

Numerator 0.3 fp

189/5-1162/65=259/13

Numerator 1.3 fp

1135/12-793/12=57/2

Numerator 2.3 fp

5211/271-5106/271+8025/271=30/1

Numerator 3.3 fp

707/13+(528/13-5/16)=1515/16

-105/23+1/4=-397/92

-299/30+3/2=-127/15

-1/5-1/45=-2/9

-305/34+9/7+19/7=-169/34

Denominator 3.2 fn

1/15-(-8/5+89/39)=-8/13

4/3×3/8×9/2=9/4

44/3÷22/13÷13/2=4/3

49/96×2586/49=431/16

12/5×1/3×173/4=173/5

158/5×20/79÷40/37=37/5

Fragment 3.1 fp

(20/3÷10/7)×3/2=7/1

Fragment 3.2 fp

(13/12×219/13)÷73/24=6/1

Reduction 1.3 fp

10782/1422=599/79

Limited 0.1 fp

1/6+2/3×1/8=1/4

Limited 1.2 fp

609/13×44/87-87/13=17/1

Limited 2.1 fp

(86/9-53/9)÷2/5=55/6

Complete 0.1 fn

-(1/2+1/10)×7/6=-7/10

Complete 1.1 fn

-7/10÷14/5-1/2=-3/4

Complete 1.2 fn

-571/12-103/3÷1442/37=-1357/28

Complete 2.1 fn

1/7×(19/4+9/4)=1/1

Comparisons

Ceil 0.4 in

-244716 > -949111

Ceil 1.4 in

-33554 < 178325

Ceil 2.4 in

-33000-626579 < 590364-135769

Ceil 3.4 in

-668800÷2 > -788012÷2

Point 0.3 dp

2.932+11.334 < 95.547-81.263

Point 0.4 dp

551.044÷3.25 = 0.64×264.925

Point 2.4 dp

405.597-304.966 < 41.823+222.594

Point 3.3 dp

13.351÷1.027 > 74.712÷8

Point 3.4 dp

1.75×39.424 < 92.16×1.575

Doted 0.3 dn

-30+57 > -45.425-10.68

Doted 1.3 dn

11.471 > -11.454

Doted 1.4 dn

358.696 < 358.713

Doted 2.3 dn

16.235+62.865 > -25.305-17.383

Doted 2.4 dn

100-666.371 < 86+480.361

Doted 3.3 dn

-10×1.92 < 94.039÷1.133

Improper 0.3 fp

256/993+560/993 < 1/2+46/3

Improper 3.3 fp

17/24×296/799 < 12/17÷72/85

Descent 0.1 fn

5/6 > -5/8

Descent 0.2 fn

-3/4×8/9 < -5/1×1/15

Descent 1.3 fn

33461/449 > 23705/449

Descent 2.2 fn

1/3+1/6 > 5/1-11/2

Descent 3.1 fn

-1/2÷3/4 < 5/6×4/5

Descent 3.2 fn

27/44÷(-81/100) < 1/2÷21/20

Equations

x÷(-13)=-23

-1+x÷577=0

-756÷(-937+x)=36

y+x=10

Rounding

Rounding 0.3 dp

4.37×0.168≈0.73

Rounding 3.3 dp

92×0.5≈46

Language Exercises

Russian Vocabulary 1.5

диф рамб

Russian Vocabulary 3.4

систем тически

English Vocabulary 1.4

festi al

English Vocabulary 2.4

cr me

Lexicon 1.4

h morous [jocular]

Infinitive 2.2

shoot [shoot]

14+

Recommended for adolescents from the age of fourteen

Integer Examples

Intellect 0.3 in

-6712-(92+1333)×53=-82237

Intellect 1.3 in

5832÷72+6855=6936

Intellect 2.3 in

-1800-81×20-1980=-5400

Intellect 3.3 in

1694+(2103-977)×50=57994

-15×(-60)÷50=18

-2500÷10=-250

952÷(-34)×95=-2660

(-20×(-25))÷2=250

-1920÷(15×(-8))×49=784

Decimal Examples

48÷2=24

3×0.01=0.03

0.72×0.225=0.162

5.544÷0.504=11

138.24÷34.56=4

213.84÷388.8×411=226.05

Denary 5.4 dp

(810÷28.125)×0.25=7.2

Definition 0.3 dp

(0.531+1.037)÷(90-84.4)=0.28

Definition 0.4 dp

130.06÷(119.396-114.751)÷345.679=0.081

Definition 1.4 dp

472.262-2.926÷4.18=471.562

Definition 2.4 dp

295.283+16.56÷460+209.761=505.08

Definition 3.3 dp

(62.824-61.816)÷(1.451-1.367)=12

Definition 3.4 dp

366.636-(331.677-25.437)÷51.04=360.636

Negatory 0.3 dn

-42.5×1.28-25.444=-79.844

Negatory 0.4 dn

456.24-65.17×8÷14=419

Negatory 1.4 dn

-3×84.48+93.275=-160.165

Negatory 2.4 dn

538.683+200×0.288×6.25=898.683

Negatory 3.3 dn

-94.5÷(30.956+8.419)×20.475=-49.14

Negatory 3.4 dn

253.724+(-560.692-271.308)÷32.5=228.124

Residual_ENG 1.3 dp

35÷5=7

Fraction Examples

Denominator 0.3 fn

-787/43+(37633/602-497/172)=1157/28

Denominator 2.3 fn

61057/630-1073/108-12913/756=699/10

Denominator 3.3 fn

-6159/232-(-1/2-783/8)=2083/29

Fragment 0.3 fp

27/2×1/27×2/3=1/3

Fragment 3.3 fp

(80/99÷10/39)×1437/65=3832/55

Limited 0.2 fp

(1/2+2/3)×116/3=406/9

Limited 1.3 fp

1108/13-10/13÷5/86=72/1

Limited 2.2 fp

34/5÷(159/7-145/7)=17/5

Complete 0.2 fn

(702/19+324/19)÷111/67=1206/37

Complete 1.3 fn

4037/790+17/395×2705/34=3371/395

Complete 2.2 fn

(1/5+1/5)÷7/15=6/7

Comparisons

Doted 0.4 dn

-330 > -800

Doted 3.4 dn

599.86÷(-29.993) > -57.8×13.2

Descent 0.3 fn

160/349+6/349 > 50/1-645/13

Descent 2.3 fn

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

Descent 3.3 fn

14885/606÷2977/48 < 1/3÷1/19

Equations

4x²=64

7x²=112

4x²+24x=0

-x²+12x-11=0

y-x=8

x+y=180

x×2y=160

10x+4y=140

-x+y=13

y+x=-1

-2y×19x=304

10x-2y=-120

Language Exercises

Russian Vocabulary 2.5

к ньон

English Vocabulary 1.5

parti ularly

English Vocabulary 2.5

a knowledge

English Vocabulary 3.4

sp ritual

Lexicon 1.5

bl me [condemn]

Lexicon 2.4

instit tion [founding]

Infinitive 1.3

withdraw withdrawn [withdraw]

Infinitive 3.2

bent [bend]

15+

Recommended for adolescents from the age of fifteen

Integer Examples

(200×(-2))÷10=-40

9568÷368=26

380÷20×970=18430

169290÷(33×(-10))=-513

Logics 4.4 in

25×(-50×32)×2=-80000

Fraction Examples

Limited 0.3 fp

8/19÷16/855+12935/466=11710/233

Limited 2.3 fp

11932/947÷(4/45+1/9)=59660/947

Complete 0.3 fn

5/6÷371/36+152/371=26/53

Complete 2.3 fn

(159/10+4293/70)×353/901=1059/35

Equations

68x²+2720x=0

8x²=968

24x²-840x=0

-x²+29x+342=0

x-y=20

y-x=62

3600x÷100y=18

47x+36y=7298

7x-2y=-234

-y-x=-10

66x÷5y=66

-60y+79x=-171

Language Exercises

Russian Vocabulary 3.5

заму

English Vocabulary 3.5

interr ption

Lexicon 2.5

disappr val [censure]

Infinitive 2.3

sight-read [sight-read]

16+

Recommended for adolescents from the age of fifteen

Equations

977x²+306778x=0

40x²=2152960

276x²+2760x=0

-x²+121x+1452=0

8x×5y=1984000

20x×38y=3754400

88x+92y=165040

y+x=20

-y-x=-72

6336x÷3y=6688

-240x-356y=268876

Language Exercises

Infinitive 3.3

find [find]

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