Maths English Medium 7 to 10

ERRATAClass: 7 Subject: MATHEMATICS Academic Year : 2011-2012

Sl. No.

Page No.

Line No. (LT/LB)* / Location

Error Description / Existing Text Correction

1 42 LB 3 Factors 6, x and y The facors are 6, x, y, 6x, 6y, xy and 6xy

2 54 LB 7 4a + 3 Rupees, 8a – 5 Rupees, ` 4a + 3, `8a – 5

3 65 LB 7 70 rupees, 130 rupees. `70, `130

4 96 LB 1 Profit % = 10 Profit = 10%

5 97 LT 3 Profit % Profit = 1%

6 114 LB 8 The formula to calculate the interest is I = pnr100

Simple Interest I = pnr100

7 171 LB 2 Symmetry Symmetry Symmetry

8 176 LT 3 supplement supplementary

9 176 LT 5 The supple..............120o The supplementary angle of 120o is 60o and the supplementary angle of 60o is 120o

10 177 Fig 5.29

11 180 Fig 5.37

12 180 Fig. 5.38

13 183 Ex. 5.11Diagram

14 184 Q.No. 3 Identity Identify

15 191 Ex. 5.14

16 220 LT9 Collection and Collecting and

17 220 LT9 Continues Data Continuous Data

18 220 LB 18 As for as As far as

19 220 LT 13 Collects Collect

20 220 LT 17 Means by Means a

o

A

B D2x x

xE o

A

B D2x x

xE

C

2

34 2

A B

3

1

4

m

l m

l

21 220 LT 18 numerical values numerical value

22 221 LT 2 115, - 120 115 - 120

23 221 LT 7 upper limit upper limit of the class

24 221 LB 9 115cm-120cm 115-120

25 236 Ex. 1.9 2. vii) 2.48 2) vii) 2.58

26 236 Ex. 1.9 3) iv) 2960.8 3) iv) 2690.0

27 236 Ex. 1.10 9) `9 9) 9 Books

28 237 Ex 2.1 5) iii) 3x, coefficient=3 5) iii) zx, coefficient=z

29 237 Ex. 2.2 2) v) 5pq, 25pq ; 3q, 70q ; p2q2, 14 p2 q2 2) (v) 5pq, 25pq; – 4p, 10p; 3q, 70q ; p2q2, 14 p2 q2

30 238 Ex. 2.3 8) 12a – 2 rupees 8. ` 12a – 2

31 238 Ex. 2.5 11) 37, 12) 60 11) 37, 38 12) `60

32 239 Ex. 3.3 2) iii) 5.25% 2) iii) 525%

33 239 Ex. 3.3 6) Boys 54 6) Boys 54%

34 239 LT 1Ex. 3.1

1) i) `360 ii) `75 iii) 325km iv) 8 v) 15

1) i) C ii) A iii) B iv) A v) D

35 239 Ex. 3.1 7) 7.5 hours 7) 7½ hours

36 239 Ex. 3.41) i)

103 ii)

2001 iii) 0.25

iv) `30 v) `7.50

1) i) D ii) B iii) A iv) C v) B

37 240 Ex. 3.51) i) 50 ii) 15 iii) profit of `35 iv) cost price v) 10

1) i) A ii) C iii) C iv) A v) B

38 240 Ex. 3.5 4) 10% 5) 12% 6) 60% 7) 15%

4) Profit 10% 5) Loss 12% 6) Profit 60% 7) Profit 15%

39 240 Ex. 3.61) i) `200 ii) `500 iii) ½year iv) 4 5year v) `15,000

1) i) B ii) A iii) A iv) C v) A

40 242 LB 11Ex 5.1

2) iv) Rhombus - 4 lines of symmetry

2) iv) Rhombus - 2 lines of symmetry

41 242 Ex. 5.2 3) ii) 72o, 5 3) ii) 360o, 1

* L.T. = Line number from the Top L.B. = Line number from the Bottom

Chairperson7th Std. Mathematics


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1 16 LT15 = 36

158

#` j = 36

158

#` j

2 50 LB5 less then the next term before it. less than the previous term.3 122 LT13 six monthly half-yearly4 127 LB3 = ` 189.40 = ` 189 = ` 189.40 - ` 1895 148 LB6 P = 21 + 11 = 33 cm. P = 21 + 11 = 32 cm.6 148 LB5 = 33 cm. = 32 cm.

7 192 In the Right Text Box, at two places Guass Gauss

8 196 LB1 = 2.23 cm2 = 22.23 cm2

9 219 LT6 Wth With

10 274

LB15Do you know?Last column (Multimodal)

3, 4, 2, 3, 1, 3, 5 4, 2, 3, 1, 3, 5

11 281LT13

Exercise 2.1Problem 2 (iii)

y2 z3

12 281LT 14

Exercise 2.1Problem 2(iii)–3xyz

3 –3

13 282

LT10Exercise 2.2Problem 2

(Row 3, Column 7)

18x3y3 18x2y3

14 282

LT12Exercise 2.2Problem 2

(Row 5, Column 6)

35x3y2 – 35x3y2

15 288LT 6

Exercise 5.3Problem 2

iv) C iv) B

16 284LB7

Exercise 2.6Problem 2 (x)

Rs.3,00,000 Wife’s share = ` 1,50,000Son’s share = ` 1,00,000

17 284LB1


3750 5000 , 3750

18 286LB7


` 19,404E.M.I. = ` 700Total Amount = ` 19,404

19 289LT5

Exercise 7.2Problem 7 (i) - (iv)

7 (i) 26 cm, (ii) 30 cm, (iii) 24 cm, (iv) 28 cm

These answers should be treated as the answers of problem 7 (i) - (iv) in Exercise 7.1


Note: The above corrections are carried out based on the GovernmentTextbooks printed in the year 2011 at Chennai, Sivakasi and Hyderabad.

Chairperson


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1 (iv) LT 7 equavalent equivalent

2 1 LB 2 consider of as considered as

3 20 LB 8 A A+ Q= A A+ Q=l

4 24 LB 12 Find

A B, , A B+ , ( )n A B, l, ( )n A B+ , A-B, B-A

Find A B, , A B+ , ( )n A B, , ( )n A B+

5 24 LB 5 E, F, E F, and E F+ U, E, F, E F, and E F+

6 32 LT 14 2m 1 2m –1

7 32 LB 7 ( ) ( )A B A B BA3 ,= - ( ) ( )A B A B B A3 ,= - -

8 32 LB 3 = ( ) ( )n A B n A B+- + ( )n B A+ = ( ) ( )n A B n A B+- + ( )n B A+ -

9 32 LB 2 ( ) ( ) ( )n A n B n A B+= + ( ) ( ) ( )n A n B n A B+= + -

10 34 LT 4 The counting numbers 1, 2, 3, are called natural numbers.

The counting numbers 1, 2, 3, g are called natural numbers.

11 34 LT 14 W = { 0, 1, 2, 3, } W = { 0, 1, 2, 3, g }

12 34 LB 2 Z = { g 3, 2, 1, 0, 1, 2, 3, g} Z = { g -3, -2, -1, 0, 1, 2, 3, g}

13 35 LT 2 1, 2, 3 are called negative integers. , ,1 2 3- - - g are called negative integers.

14 37 Key conceptexpansion of

qp , expansion of

qp ,q 0!

15 38 LT 2expansion of

qp , expansion of

qp ,q 0!

16 38 decimal representation table No. 3, 6, 7, 9

After 0 decimal point missing 0 3 , 016 , 0 142857 , 0 1

put decimal point after 0 .0 3 , .0 16 , .0 142857 , .0 1

17 39 LB 6 1.4 1.5

18 41 LT 5rational number

qp , rational number

qp , q 0!

19 49 LB 12, 11, 9, 7, 5, 3, 1 4 26 .4 26

20 51 LT 13 a b a b-

21 51 LB 10 ( 2) ( 2) 4# = ( ) ( )2 2 4#- - =

22 52 LB 13 2 + ( 2 ) = 0 2 + ( 2- ) = 023 52 LB 11 3 2 3 2-

24 52 LB 10 53 3 5- .25 66 LB 9, 2 0 000549 0.000549

26 66 LB 1 = 5 49 = 5.49

27 70 LT 1, 25, 26 Decimal point is missing(4 0)3, (0 0001)2, 0003 0 0002 0 001

7 5 3# '^ ^ ^h h h

put decimal point where ever it is applicable(4 0)3, (0 0001)2, . . .0 003 0 0002 0 001

7 5 3# '^ ^ ^h h h

28 70 LT 9 0.00003 3.0 10 5#= 0.00003 3.0 10 5

#= -

29 70 LT 10 .3 0 10 5 5#= ^ h = .3 0 105 5 5

#^ ^h h .3 0 10 5 5#= -^ h = . 103 0 55 5

# -^ ^h h

30 LT 11 = 243 10 25#

= 2.43 10 102 25# # 2.43 10 23

#=

= 243 10 25# -

= 2.43 10 102 25# # - 2.43 10 23

#= -

31 LT 14=

( . )

.

1 0 10

2 0 104 4

3 2

#

#^ h = .

. ( )

1 0 10

2 0 104 4 4

2 3 2

#

#

^ ^^

h hh

= (1.0 10 )

2.0 104 4

3 2

#

#-

^ h =

.

. ( )

1 0 10

2 0 104 4 4

2 3 2

#

#-^ ^

^h hh

32 LT 22 (i) 3.25 10 6# (ii) 4.134 10 4

# (i) 3.25 10 6# - (ii) 4.134 10 4

# -

33 74 LT 14, LB 12, LB9 for the first three rules a, M, N are positive numbers, a 1! . are missing

a, M, N are positive numbers, a 1! .

34 81 LB 14 greater than 1, ... positive greater than or equal to 1, ... non negative

35 158 LB 7, LB 5, LB 1 0.7695 0.7965

36 179 LB 3+AOB =

21 +ACB +AOB = 2+ACB

37 190 LB 5, 4 = 9000 , 0360210 5 25# = = ,

360120 9000 3 000# =

38 196 LB 5 11 cm, b = 10 cm, h = 7 cm 11 m, b = 10 m, h = 7 m

39 196 LB 1 770 cu.cm. 770 cu.m.

40 209 LB 5 Draw the ABCD with the Draw the ABCD with thegiven measurments.

41 218 LT 14 x = –2, 0, 2 , 0,x 4 4=-

42 276 LB 4 (ii) P(A) (ii) P(X)

43 276 LB 2 (iv) the answer not given (iv) P A z=^ h " ,

44 276 LT 4 (iii) {x : x is a multiple of 3} (iii) {x : x is a positive integer and a multiple of 3}

45 277 LT 5 (ii) , , ,A B 2 4 6 8, = " , (ii) , , ,A B 2 4 6 8, = " ,, A B+ z=

46 277 LT 8 , , , ,X Y 4 8 12 16 20, = " , , , , ,X Y 4 8 12 16 20+ = " ,

47 277 LT 14 , , , , ,A B 1 2 4 6 8 10, =l l " , , , , , , ,A B 1 2 4 6 7 8 10, =l l " ,

48 284 LB 2 6.3 cm , 6.3 cm2,

49 287 40 B, 96 D, 97 B, 98 A, 99 D, 102 D, 104 D, 105 C, 133 A

40 A, 96 C, 97 A, 98 C, 99 A, 102 C, 104 B, 105 A, 133 B


Chairperson9th Std. Mathematics


Sl. No.

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1 vLT 11

Content(I.Sets)

(iv) Formula for (iv) Formula for ( )n A B C, ,

2 viiLB 14

Content(VI. Geometry)

(vi) Not printed (vi) Pythagoras theorem and Tangent -Chord theorem (without proof)

3 15 Q. No. 9Exercise 1.2

(iv) ( )A B A B+ ,=l l l

(vi) A\(B + C) = (A\B) ,(A\C)To be deleted

4 17

LT 10 Not printed ( )n M C P 14+ + =

LT 18Example 1.12 Not printed The number of students who had taken one course

only = 24 + 60 + 22 = 106

5 18 Exercise 1.3Q.No.6

In a town 85% of the people speak English, 40% speak Tamil and 20% speak Hindi. Also 42% speak English and Tamil, 23% speak Tamil and Hindi

In a town 85% of the people speak Tamil, 40% speak English and 20% speak Hindi. Also 32% speak English and Tamil, 13% speak Tamil and Hindi

6 28Example 1.22

(iv)LT 5

Therefore,f (4) = 3 (4)2 – 1 = 3 (16) – 1 = 48 – 1 = 47Hence, f (2) – f (4) = 3 – 47 = 45

Therefore,f (4) = 3 (4)2 – 10 = 3 (16) – 10 = 48 – 10 = 38Hence, f (2) – f (4) = 3 – 38 = – 35

7 28 Exercise 1.4Q. No. 4 From A to B From X to Y

8 54 Exercise 2.4Q. No. 12 Find the sum of all numbers Find the sum of all natural numbers

9 58 LT 10Example 2.28 S64 = S25 =

10 64 LB 1Example 2.34

= (12 + 22 + 33 + ... + 242) – (12 + 22 + 33 + ... + 102)

= (12 + 22 + 32 + ... + 242) – (12 + 22 + 32 + ... + 102)

11 116LT15

Exercise 3.19Q. No. 23

(D) a – b = a

b ac42- (D)

cb1 1

a b+ =-

12 175 LB 8 Case (ii) Externally Case (ii) Externally (Not for examination)

13 177 LT 9 Case (ii) Externally Case (ii) Externally (Not for examination)

14 191 LT 9 Theorem 6.9 Converse of Theorem Theorem 6.8Converse of Tangent - Chord Theorem

15 191 LB 8 the chord is one chord is

16 195 LT 2 & LT 3Q. No. 12 units are not given units in cms.

17 216LT17


29 3 m/s 29 3 m/minute.

18 231 LT 15 (ii) Volume of a hollow cylinder (ii) Volume of a hollow cylinder (Volume of the material used)

19 235 LT 10LT 11

l = ( )h R r2 2 2+ +

l = ( )h R r2 2 2+ -

l = ( )h R r2 2+ -

l = ( )h R r2 2+ -

20 236

Below the figure 8.38

LB 5

(ii) Volume of a hollow sphere

(iv) Volume of a hollow hemisphere

(ii) Volume of a hollow sphere (Volume of the material used)(iv) Volume of a hollow hemisphere (Volume of the material used)

21 259LT 5


R = 60° R = 25°

22 309LT 12

Exercise 12.1Q. No.18

are put in the bag, the probability of drawing a white ball will be twice that of in (i). Find x.

are put in the bag and if the probability of drawing a white ball will be twice that of in (i), then find x.

23 317 LT 8Exercise 1.2

2 (i) ( )A A B, +l (or) ( \ )A B l

2. Various answers are possible for (i) to (iv). One such answers is (i) ( )A A B, +l (or) ( \ )A B l

24 317 LT 10 6. 30 % 6. 10%

25 317 LT 16Exercise 1.4 3 (i) one-one function 3 (i) neither one-one nor

onto function

26 318 LT 19Exercise 2.2 16. A.P., `91,500 16. A.P., `95,000

27 318 LB 4Exercise 2.4

3(ii) 3755. – 3240

3 (ii) – 755. – 820

28 318 LB 3Exercise 2.4 7. 8 terms 7. 8 terms or 23 terms


12. 1399515. Not an arithmetic series

12. 12000 To be deleted

30 318 LB 1Exercise 2.4 20. 3625 bricks 20. 1225 bricks

31 319 LT 4Exercise 2.5 8 (ii) 1 –

32 1

101 n

- ` j8 B 8 (ii) n – 32 1

101 n

- ` j8 B

32 319 LT 7Exercise 2.6 1 (v) 10630 1 (v) 10650

33 319 LT 10 & LT11Exercise 2.7

1 A

1 B

34 320 LT 10Exercise 3.6 3 (i) 4x2 – 16x + 12 3 (i) x2 – 4x + 3

35 322 LT 8Exercise 3.18 6. x2 – 3x + 2 = 0 6. x2 + 3x + 2 = 0


5. 1 × 30, 30 × 1, 2 × 15 15 × 2, 3 × 10, 10 × 3 5 × 6, 6 × 5, 10 × 1 1 × 10, 15 × 1, 1 × 15

5. 1 × 30, 30 × 1, 2 × 15, 15 × 2, 3 × 10, 10 × 3, 5 × 6, 6 × 5

37 322 LB 1Exercise 4.1 9. A = 2

3

4

1

5

0c m 9. AT = 2

3

4

1

5

0c m

38 324 LT 3Exercise 5.2 5 (ii) 8 sq. units 5 (ii) 43 sq. units

39 325LT 3LT 4

Exercise 6.1

2 (i) No. (ii) Yes3. 7.5 cm9.(iii) 4

2. 7.5 cm3.(i) No. (ii) Yes9. (iii) 4 cm.

40 325 LT 7Exercise 6.2 8. 166.25 cm2 8. 166.25 cm

41 325 LT 11Exercise 6.3 3 (ii) 1 cm 3 (ii) 5 cm


9. 26400 cm3

10. 1848 cm39. 8800 cm3

10. 616 cm3

43 326 LT 17Exercise 8.3 3. 70 r cm2 3. 220 mm2

44 327

LT 4LT 5LT 6

Exercise 11.1

7. 31.6112. 53.516. 20.43

7. 6.3212. 54.1916. 20.41


10. B

10 D

46 327 LB 10Exercise 12.1 18. 3 18. (i)

41 (ii) 3

* LT = Line number from the Top LB = Line number from the BottomChairperson

10th Std. Mathematics

Maths English Medium 7 to 10

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