Fractions (Exercise – 7.4)

FRACTIONS


EXERCISE – 7.4


EX 7.4 QUESTION 1.


Solution:

Solution:
(a) Total number of divisions = 8
(i) Number of shaded parts = 3
∴ Fraction = 3/8

(ii) Total number of divisions = 8
Number of shaded parts = 6
∴ Fraction = 6/8

(iii) Total number of divisions = 8
Number of shaded parts = 4
∴ Fraction = 4/8

(iv) Total number of divisions = 8
Number of shaded part = 1
∴ Fraction = 1/8
Now the fractions are:

NCERT Solutions for Class 6 Maths Chapter 7 Fractions

(b)(i) Total number of divisions = 9
Number of shaded parts = 8
∴ Fraction = 8 / 9
(ii) Total number of divisions = 9
Number of shaded parts = 4
∴ Fraction = 4 / 9
(iii) Total number of divisions = 9
Number of shaded parts = 3
∴ Fraction = 3 / 9
(iv) Total number of divisions = 9
Number of shaded parts = 6
∴ Fraction = 6 / 9

Now the fractions are:

NCERT Solutions for Class 6 Maths Chapter 7 Fractions


EX 7.4 QUESTION 2.


2. Compare the fractions and put an appropriate sign.

(a) 3 / 6 ☐ 5 / 6

(b) 1 / 7 ☐ 1 / 4

(c) 4 / 5 ☐ 5 / 5

(d) 3 / 5 ☐ 3 / 7

Solution:

(a) Here both fractions have same denominators. So, the fraction 3 < 5.

∴ 3 / 6 < 5 / 6

(b) Multiply by 4

1 / 7 = (1 × 4) / (7 × 4)

= 4 / 28

Multiply by 7

1 / 4

= (1 × 7) / (4 × 7)

= 7 / 28

Here 4 < 7

∴ 1 / 7 < 1 / 4

(c) Here both fractions have same denominators. So, the fraction 4 < 5.

∴ 4 / 5 < 5 / 5

(d) Here both numerators are the same. So, the fraction having less denominator will be the highest factor

∴ 3 / 7 < 3 / 5


EX 7.4 QUESTION 3.


Make five more such pairs and put appropriate signs.

Solution:

(a) 2 / 7 >  2 / 11

(b) 6 / 8 > 3 / 8

(c) 4 /9 > 3/ 9

(d) 1 / 9 < 5 / 9

(e) 4 /10 < 6 / 10


EX 7.4 QUESTION 4.


Look at the figures and write ‘<’ or ‘>’, ‘=’ between the given pairs of fractions.

 

(a) 1 / 6 ☐ 1 / 3

(b) 3 / 4 ☐ 2 / 6

(c) 2 / 3 ☐ 2 / 4

(d) 6 / 6 ☐ 3 / 3

(e) 5 / 6 ☐ 5 / 5

Solutions:

(a)  1 / 6 < 1 / 3

(b) 3 / 4 > 2 / 6

(c) 2 / 3 > 2 / 4

(d) 5 / 6 < 5 / 5


EX 7.4 QUESTION 5.


How quickly can you do this? Fill appropriate sign. ( ‘<’, ‘=’, ‘>’)

(a) 1 / 2 ☐ 1 / 5

(b) 2 / 4 ☐ 3 / 6

(c) 3 / 5 ☐ 2 / 3

(d) 3 / 4 ☐ 2 / 8

(e) 3 / 5 ☐ 6 / 5

(f) 7 / 9 ☐ 3 / 9

(g) 1 / 4 ☐ 2 / 8

(h) 6 / 10 ☐ 4 / 5

(i) 3 / 4 ☐ 7 / 8

(j) 6 / 10 ☐ 3 / 5

(k) 5 / 7 ☐ 15 / 21

Solutions:


EX 7.4 QUESTION 6.


The following fractions represent just three different numbers. Separate them into three groups of equivalent fractions, by changing each one to its simplest form.

(a) 2 / 12 (b) 3 / 15 (c) 8 / 50 (d) 16 / 100 (e) 10 / 60 (f) 15 / 75

(g) 12 / 60 (h) 16 / 96 (i) 12 / 75 (j) 12 / 72 (k) 3 / 18 (l) 4 / 25

Solutions:

(a) 2 / 12

= (1 × 2) / (6 × 2)

= 1 / 6

(b) 3 / 15

= (1 × 3) / (5 × 3)

= 1 / 5

(c) 8 / 50

= (4 × 2) / (25 × 2)

= 4 / 25

(d) 16 / 100

= (4 × 4) / (25 × 4)

= 4 / 25

(e) 10 / 60

= (1 × 10) / (6 × 10)

= 1 / 6

(f) 15 / 75 = (1 × 15) / (5 × 15)

= 1 / 5

(g) 12 / 60

= (1 × 12) / (5 × 12)

= 1 / 5

(h) 16 / 96

= (1 × 16) / (6 × 16)

= 1 / 6

(i) 12 / 75

= (4 × 3) / (25 × 3)

= 4 / 25

(j) 12 / 72

= (1 × 12) / 6 × 12)

= 1 / 6

(k) 3 / 18

= (1 × 3) / (6 × 3)

= 1 / 6

(l) 4 / 25

Totally there are 3 groups of equivalent fractions.

1 / 6 = (a), (e), (h), (j), (k)

1 / 5 = (b), (f), (g)

4 / 25 = (d), (i), (l)


EX 7.4 QUESTION 7.


Find answers to the following. Write and indicate how you solved them.

(a) Is 5 / 9 equal to 4 / 5

(b) Is 9 / 16 equal to 5 / 9

(c) Is 4 /5 equal to 16 / 20

(d) Is 1 / 15 equal to 4 / 30

Solutions:

(a) 5 / 9, 4 / 5

By cross-multiplying,

5 x 5 = 25 and 4 x 9 = 36
25 ≠ 36

Hence, 5 / 9 is not equal to 4 / 5

(b) 9 / 16, 5 / 9

By cross-multiplying,
9 x 9 = 81 and 16 x 5 =80
81 ≠ 80

Hence, 9 / 16 is not equal to 5 / 9

(c) 4 / 5, 16 / 20

By cross-multiplying
4 x 20 = 80 and 5 x 16 = 80
80 = 80

Hence, 4 / 5 is equal to 16 / 20

(d) 1 / 15, 4 / 30

By cross-multiplying,
1 x 30 = 30 and 4 x 15 = 60

Hence, 1 / 15 is not equal to 4 / 30


EX 7.4 QUESTION 8.


Ila read 25 pages of a book containing 100 pages. Lalita read 2 / 5 of the same book. Who read less?

Solutions:

Total number of pages a book has = 100 pages

Lalita read = 2 / 5 × 100 = 40 pages

Ila read = 25 pages

∴ Ila read less than Lalita.


EX 7.4 QUESTION 9.


 Rafiq exercised for 3 / 6 of an hour, while Rohit exercised for 3 / 4 of an hour. Who exercised for a longer time?

Solutions:

Rafiq exercised = 3 / 6 of an hour

Rohit exercised = 3 / 4 of a hour

3 / 6, 3 / 4

Convert these into like fractions

3 / 6 = (3 × 2) / (6 × 2)

= 6 / 12

3 / 4 = (3 × 3) / (4 × 3)

= 9 / 12

Clearly, 9 / 12 > 6 / 12

∴ 3 / 4 > 3 / 6

Therefore Rohit exercised for a longer time than Rafiq.


EX 7.4 QUESTION 10.


10. In a class A of 25 students, 20 passed with 60% or more marks; in another class B of 30 students, 24 passed with 60% or more marks. In which class was a greater fraction of students getting with 60% or more marks?

Solutions:

Total number of students in Class A = 25

Students passed in first class in Class A = 20

Hence, fraction = 20 / 25

= 4 / 5

Total number of students in Class B = 30

Students passed in first class in Class B = 24

Hence, fraction = 24 / 30

= 4 / 5

∴ An equal fraction of students passed in first class in both the classes