# Collins Maths Solutions Class 7 Chapter 2

## Collins Maths Solutions Class 7 Chapter 2 Rational Numbers

Welcome to NCTB Solution. Here with this post we are going to help 7th class students for the Solutions of Collins Maths Class 7 Mathematics, Chapter 2, Rational Numbers. Here students can easily find Exercise wise solution for chapter 2, Rational Numbers. Students will find proper solutions for Exercise 2.1, 2.2, 2.3, 2.4 and 2.5 Our teacher’s solved every problem with easily understandable methods so that every students can understand easily. Here in this post all the solutions are based on ICSE latest Syllabus.

Rational Numbers Exercise 2.1 Solution :

Question no – (1)

Solution :

(a) Numerator =  1

Denominator =  5

(b) Numerator =  -11

Denominator = 13

(c) Numerator =  -14

Denominator = -15

(d) Numerator =  7

Denominator = – 8

(e) Numerator = 5

Denominator = 1

Question no – (2)

Solution :

(a)  Given statement is False

(b) Given statement is True

(c) Given statement is True

(d) Given statement is False

(e) Given statement is True

Question no – (3)

Solution :

(a) -18

=  – 36/2

(b) 29

=  87/3

(c) -101

=  -201/2

(d) 315

=  6 30/2

(e) – 1234

=  – 2468/2

Question no – (5)

Solution :

(a) 29/-3

=  5/-8

=  35/-56

(b) 35/17

=  5/-8

= 40/-64

(c) -25/20

=  5/-8

=  50/-80

Question no – (7)

Solution :

(a) 4/6 = 40/60

(b) 2/3 =  14/21

(c) 6/8 = 18/24

(d) 6/8 = 42/56

Question no – (8)

Solution :

(a) 4/9 =  8/18, 12/27, 16/36, 20/45

(b) -3/5 = -6/10, -9/15, -12/20, -15/25

(c) 8/-11 = 16/-22, 24/-33, 32/-44, 40/-55

(d) 7/-9 =  14/-18, 21/-27, 28/-36, 35/-45

Question no – (9)

Solution :

(a) 2/-14 =  1/-7

(b) -10/-8 =  5/4

(c) 32/288/7

(d) -16/20 =  -4/5

(e) -24/80 = -6/20

=  – 3/10

(f) 28/63 =  4/9

Question no – (10)

Solution :

(a) -8/5 and 546/-35

– 8 × (-35) =  + 280

and (56 × 5) =  280

So, yes, it is equal.

(b) -12/7 and 32/21

(-12 × 21) =  – 252

and, (32 × 7) =  224

So, it is not equal.

(c) -7/3 and 84/-36

(-7 × 36) =  + 252

and, (3 × 84) =  252

So, Yes, it is Equal.

Question no – (11)

Solution :

(a) 25/125 =  100/625

(b) 34/84 l =  204/504

Rational Numbers Exercise 2.2 Solution :

Question no – (1)

Solution :

(a) 5/9 and -4/9

=  45 > -36

5/9 > – 4/3

(b) -4/7 and 5/-7

=  + 28 < 35

-4/7 < 5/-7

(c) -3/7 and 0

-3/7 < 0

(d) 5/9 and -4/5

=  25 >  – 36

∴ 5/9 > -4/5

(e) -8 and -11/2

=  -16 < – 11

-8 < -11/2

Question no – (2)

Solution :

(a) 2/3, 4/5, 3/7

L.C.M of 3, 5, 7 =  105

2/3 =  2 × 35/3 × 35 =  70/105

4/5 =  4 × 21/5 × 21 =  84/105

3/7 =  3 × 15/7 × 15 =  45/105

In ascending order,

= 3/7 < 2/3 <  4/5

(b) 3/5, -7/10, -11/12, -13/-30

L.C.M is = 60

=  3/5 = 3 × 12/5 × 12 =  36/60

= -7/10 = -7 × 6/10 × 6 =  -42/60

= -11/12 =  -11 × 5/12× 5  =  -55/60

=  -13/-30  =  -13 × (-2)/-30 × (-2) =  26/60

In ascending order,

= -11/12 < -7/10 < -13/-30 < 3/5

(c) 2/3, 4/7, -8/3, 6/9

L.C.M of 3,7,3 -9 is =  63

= 2/3 =  2 × 21/3 × 21 =  42/63

=  4/7 =  4 × 9/7 × 9 =  36/63

=  -8/3 =  -8 × 21/3× 21 =  -42/63

=  6/-9 =  6 × (-7)/-9 × (-7)  =  -42/63

In ascending order,

= -8/3 < 6/-9 < 4/7 < 2/3

(d) -8/9, 5/-2, 5/-6, -5/3

L.C.M is =  18

=  -8/9 =  -8 × 2/9× 2 =  -16/18

=  5/-2 =  5 × (9)/-2 × (9) =  -45/18

=  5/-6 =  5 × (-3)/-6 × (-3) =  -15/18

=  -5/3 =  -5 × 6/3 × 6 =  -30/18

In ascending order,

= 5/-2 < -5/3 < -8/9 < 5/-6

(e) -2/3, -7/18, -5/12, -4/9

L.C.M is =  36

=  -2/3 =  -2 × 12/3 × 12 =  -24/36

=  -7/18 =  -7× 2/18 × 2 =  -14/36

=  -5/12 = -5 × 3/12 × 3 =  -15/36

=  -4/9 =  -4 × 4/9 × 4 =  16/36

In ascending order,

-2/3 < -4/9 < -5/12 < -7/18

Question no – (3)

Solution :

(a) 4/9, -4/3, -7/-12, -11/24

L.C.M is =  72

=  4/9 =  4 × 8 /9 × 8 =  32/72

=  -4/3 = -4 × 24/3 × 24 =  -96/72

=  -7/-12 =  – 7 × (-6) /- 12 × (-6) =  42/72

=  -11/24 =  -11 × 3/ 24 × 3 =  -3372

In descending order,

=  -7/12 > 4/9 > -11/24 > -4/3

(b) 3/4,  5/-8, 3/-16, -5/-8

L.C.M is =  169

=  3/4  =  3 × 4/4 × 4 =  12/16

=  5/-8 = 5 × (-2)/-8 × (-21) =  -3/16

=  3/-16 =  3 × (-1)/-16 × (-1) =  -3/16

=  -5/-8

=  -5

Rational Numbers Exercise 2.3 Solution :

Question no – (1)

Solution :

Five rational number between -2 and 2

-2 =  – 10/5

2 =  10/5

Five rational number are,

=  -9/5, -6/5, 1/5, 4/5, 8/5

Question no – (2)

Solution :

Six rational numbers between -3/11 and 8/11.

Six rational number are,

=  -2/11, -1/11, 2/11, 4/11, 5/11, 6/11

Question no – (3)

Solution :

Three rational numbers 1/3 and 1/74

Three rational numbers are,

=  1/4, 1/5, 1/6

Question no – (4)

Solution :

Ten rational number between 4/5 and 2/7

4/5 and 2/7

= 4/5 = 4 × 7/5 × 7 =  28/35

=  2/7 =  2 × 8/7 × 8 =  10/35

Rational numbers are, 11/35, 12/35, 13/35, 14/35, 15/35, 16/35, 17/35, 18/35, 19/35, 20/35, 21/35

Rational Numbers Exercise 2.4 Solution :

Question no – (1)

Solution :

(a) 5/6 + (- 1/6)

=  5/6 – 1/6

=  5 – 1/6

=  4/6

=  2/3

(b) 9/17 + (-5/17)

=  9/17 – 5/17

=  9 – 5/17

=  4/17

(c) -17/15 + (-1/15)

=  17/15 – 1/15

=  – 17 – 1 /15

=  -18/15

=  -6/5

(d) 5/6 + 7/9

=  45 + 42/54

=  87/54

=  1 11/18

(e) 5/8 + (-7/2)

=  5/8 – 7/2

=  5 – 28/8

=  – 23/8

=  – 2 7/8

(f) 7/-18 +  8/27

=  – 21 + 16/54

=  -5/54

Question no – (2)

Solution :

(a) 4/6 – (-7/9)

=  4/6 + 7/9

=  12 + 14/18

=  26/18

= 13/9

= 1 4/9

(b) 5/6 – 3/4

=  10 -9/12

=  1/12

(c) -3/8 – 1/4

= -3 – 2/8

=  -5/8

(d) -5/26 – (-4/13)

=  – 5/26 + 4/13

=  – 5 + 8/26

=  3/26

(e) 13/15 – 12/625

= 65 – 36/75

= 29/7

(f) (-2/7) – (-3/-8)

= -2/7 – 3/8

= -16 – 21/56

= -37/56

Question no – (3)

Solution :

(a) 7/11 × 5/4

= 35/44

(b) -2/9 × 5/11

= -10/99

(c) 25/-9 × 3/-10

=  5/+6

(d) 16/-21 × 14/5

= 32/-15

(e) -12/5 × 10/-3

= 4 × 10/5

=  8

(f) 5/-18 × -9/20

= 5/2 × 20

= 1/8

Question no – (4)

Solution :

(a) 5 ÷ -5/7

=  5 × 7/-5

= -7

(b) -16/35 ÷ -15/14

= 16/35 × 14/-15

= 32/75

(c) -12/7 ÷ 18

= 12/7 × 1/18

= -2/21

(d) 4/9 ÷ -5/12

= 4/9 × 12/-5

= 16/-15

(e) -3/4 ÷ -6

= – 3/4 × 1/6

= – 1/8

(f) 2/3 ÷ -7/12

=  2/3 × 12/-7

= 8/-7

Rational Numbers Exercise 2.5 Solution :

Question no – (1)

Solution :

(a), (c) and (d) are terminating decimal and (b), (e), (f) are non terminating decimal.

Question no – (2)

Solution :

(a) 0.7

=  7/9

(b) 0.89

= 89/99

(c) 0.567

= 567/999

(d) 0.243

= 243/900

Question no – (3)

Solution :

Distance by A,

=  7/9 + 1/3

= 7 + 3/9

= 10/9 km

Distance by B

= 3/4 + 1/5

= 15 + 4/20

= 19/20

Therefore, “A” travel more distance.

Question no – (4)

Solution :

Sugar sold,

= (75 3/4 × 1/4)

= 303/4 × 1/4

= 303/16 kg.

The shop keeper sold 303/16 kg sugar.

Question no – (5)

Solution :

Doses are there in bottle,

= 1 1/2 ÷ 3/14

= 3/2 × 14/3

=  7 dose

There are 7 doses in the bottle.

Question no – (6)

Solution :

Difference in water level,

= |(2/3 – 4/5)|

= |10 – 12/15|

= 2/15

Therefore, the difference between two cups will be 2/15

Next Chapter Solution :

Updated: June 15, 2023 — 6:12 am