Chapter -2 Fractions and Decimals | Class 7th |NCERT Maths Solutions | Edugrown

Ex 2.1 Class 7 Maths Question 1.
Solve :

Solution:

Ex 2.1 Class 7 Maths Question 2.
Arrange the following in descending order :

Solution:
We observe that the given fractions neither have a common denominator nor a common numerator. So, first we convert them into like fractions, i.e., fractions having common denominator. For this, we first find the L.C.M. of the denominators of the given fractions.

Ex 2.1 Class 7 Maths Question 3.
In a “magic square”, the sum of the numbers in each row, in each column and along the diagonals is the same. Is this a magic square?

Solution:

⇒ The sum of the numbers in each row, in each column and along the diagonals is the same.
So, the given square is a magic square.

Ex 2.1 Class 7 Maths Question 4.
A rectangular sheet of paper is 12 12 cm long and 10 23 cm wide.Find its perimeter.
Solution:

Ex 2.1 Class 7 Maths Question 5.
Find the perimeters of (i) ∆ ABE (ii) the rectangle BCDE in this figure. Whose perimeter is greater?

Solution:

Ex 2.1 Class 7 Maths Question 6.
Salil wants to put a picture in a frame. The picture is 7 35 cm wide. To fit in the frame, the picture cannot be more than 7 310 cm wide. How much should the picture be trimmed?
Solution:

Ex 2.1 Class 7 Maths Question 7.
Ritu ate 35 part of an apple and the remaining apple was eaten by her brother Somu. How much part of the apple did Somu eat? Who had the larger share? By how much?
Solution:

Ex 2.1 Class 7 Maths Question 8.
Michael finished colouring a picture in 712 hour. Vaibhav finished colouring the same picture in 34 hour. Who worked longer? By what fraction was it longer?
Solution:

Ex 2.2 Class 7 Maths Question 1.
Which of the drawings (a) to (d) show :

Solution:
(i) → (d)
(ii) → (b)
(iii) → (a)
(iv) → (c)

Ex 2.2 Class 7 Maths Question 2.
Some pictures (a) to (c) are given below. Tell which of them show :

Solution:
(i)  → (c)
(ii) → (a)
(iii) → (b)

Ex 2.2 Class 7 Maths Question 3.
Multiply and reduce to lowest form and convert into a mixed fraction.

Solution:

Ex 2.2 Class 7 Maths Question 4.
Shade :
(i) 12 of the circles in box (a)
(ii) 23 of the triangles in box (b)
(iii) 35 of the squares in box (c).

Ex 2.2 Class 7 Maths Question 5.
Find :

Solution:

Ex 2.2 Class 7 Maths Question 6.
Multiply and express as a mixed fraction :

Solution:

Ex 2.2 Class 7 Maths Question 7.
Find :

Solution:

Ex 2.2 Class 7 Maths Question 8.
Vidya and Pratap went for a picnic. Their mother gave them water bottle that contained 5 litres of water. Vidya consumed 25 of the water. Pratap consumed the remaining water.
(i) How much water did Vidya drink?
(ii) What fraction of the total quantity of water did Pratap drink?
Solution:

Ex 2.2 Class 7 Maths Question 1.
Which of the drawings (a) to (d) show :

Solution:
(i) → (d)
(ii) → (b)
(iii) → (a)
(iv) → (c)

Ex 2.2 Class 7 Maths Question 2.
Some pictures (a) to (c) are given below. Tell which of them show :

Solution:
(i)  → (c)
(ii) → (a)
(iii) → (b)

Ex 2.2 Class 7 Maths Question 3.
Multiply and reduce to lowest form and convert into a mixed fraction.

Solution:

Ex 2.2 Class 7 Maths Question 4.
Shade :
(i) 12 of the circles in box (a)
(ii) 23 of the triangles in box (b)
(iii) 35 of the squares in box (c).

Ex 2.2 Class 7 Maths Question 5.
Find :

Solution:

Ex 2.2 Class 7 Maths Question 6.
Multiply and express as a mixed fraction :

Solution:

Ex 2.2 Class 7 Maths Question 7.
Find :

Solution:

Ex 2.2 Class 7 Maths Question 8.
Vidya and Pratap went for a picnic. Their mother gave them water bottle that contained 5 litres of water. Vidya consumed 25 of the water. Pratap consumed the remaining water.
(i) How much water did Vidya drink?
(ii) What fraction of the total quantity of water did Pratap drink?
Solution:

Chapter 2 Fractions and Decimals Exercise 2.3

Ex 2.3 Class 7 Maths Question 1.
Find :

Solution:

Ex 2.3 Class 7 Maths Question 2.
Multiply and reduce to lowest form (if possible) :

Solution:

Ex 2.3 Class 7 Maths Question 3.
Multiply the following fractions :

Solution:

Ex 2.3 Class 7 Maths Question 4.
Which is greater?

Solution:

Ex 2.3 Class 7 Maths Question 5.
Saili plants 4 saplings in a row, in her garden. The distance between two adjacent saplings is 34 m. Find the distance between the first and the last sapling.
Solution:
Let four saplings be planted in a row at the points A, B, C and D such that AB = BC = CD = 34 m

Ex 2.3 Class 7 Maths Question 6.
Lipika reads a book for 1 34 hours everyday. She reads the entire book in 6 days. How many hours in all were required by her to read the book?
Solution:

Ex 2.3 Class 7 Maths Question 7.
A car runs 16 km using 1 litre of petrol. How much distance will it cover using 2 34 litres of petrol?
Solution:

Ex 2.3 Class 7 Maths Question 8.
(a) (i) Provide the number in the box ( ), such that 23 × ( ) = 1030
(ii) The simplest form of the number obtained in ( ) is __________
(b) (i) Provide the number in the box ( ) such that 35 × ( ) = 2475
(ii) The simplets form of the number obtained in ( ) is __________
Solution:

Ex 2.4 Class 7 Maths Question 1.
Find :

Solution:

Ex 2.4 Class 7 Maths Question 2.
Find the reciprocal of each of the following fractions. Classify the reciprocals as proper fractions, improper fractions and whole numbers.

Solution:

Ex 2.4 Class 7 Maths Question 3.
Find :

Solution:

Ex 2.4 Class 7 Maths Question 4.
Find:

Solution:

Ex 2.5 Class 7 Maths Question 1.
Which is greater?
(i) 0.5 or 0.05
(ii) 0.7 or 0.5
(iii) 7 or 0.7
(iv) 1.37 or 1.49
(v) 2.03 or 2.30
(vi) 0.8 or 0.88
Solution:
(i) To compare 0.5 and 0.05
Here, the whole number part in each decimal is equal to zero. So, whole number parts are equal. Therefore, we will compare the decimal parts. We observe that the extreme left digits in the decimal parts are 5 and 0, respectively such that 5 > 0.
∴ 0.5 > 0.05

(ii) To compare 0.7 and 0.5
Here, the whole number parts are equal, so we compare the decimal parts. In the decimal parts, the extreme left digits are 7 and 5, respectively such that 7 > 5.
∴ 0.7 > 0.5

(iii) To compare 7 and 0.7
The given decimals have distinct whole numbers, so we compare whole number parts only. These are 7 and 0, respectively such that 7 > 0.
∴ 7 > 0.7

(iv) To compare 1.37 and 1.49
Here, the whole number parts are equal, so we compare the decimal parts. In the decimal parts, the extreme left digits are 3 and 4, respectively such that 3 < 4; i.e., 4 > 3.
∴ 1.49 > 1.37

(v) To compare 2.03 and 2.30
Here, the whole number parts are equal, so we compare the decimal parts. In the decimal parts, the extreme left digits are 0 and 3, respectively such that 0 < 3, i.e., 3 > 0.
∴ 2.30 > 2.03

(vi) To compare 0.8 and 0.88
Here, the whole number parts are equal, so we compare the decimal parts. In decimal part also, digits up to tenths place are equal. So, compare the digits at hundredths place. The digits at hundredths place are 0 and 8 such that 8 > 0.
∴ 0.88 > 0.8

Ex 2.5 Class 7 Maths Question 2.
Express as rupees using decimals :
(i) 7 paise
(ii) 7 rupees 7 paise
(iii) 77 rupees 77 paise
(iv) 50 paise
(v) 235 paise
Solution:

Ex 2.5 Class 7 Maths Question 3.
(i) Express 5 cm in metre and kilometre
(ii) Express 35 mm in cm, in and km
Solution:

Ex 2.5 Class 7 Maths Question 4.
Express in kg :
(i) 200g
(ii) 3470 g
(iii) 4 kg 8 g
Solution:

Ex 2.5 Class 7 Maths Question 5.
Write the following decimal numbers in the expanded form :
(i) 20.03
(ii) 2.03
(iii) 200.03
(iv) 2.034
Solution:

Ex 2.5 Class 7 Maths Question 6.
Write the place value of 2 in the following decimal numbers :

1. 2.56
2. 21.37
3. 10.25
4. 9.42
5. 63.352

Solution:

1. Place value of 2 in 2.56 is ones.
2. Place value of 2 in 21.37 is tens.
3. Place value of 2 in 10.25 is tenths.
4. Place value of 2 in 9.42 is hundredths.
5. Place value of 2 in 63.352 is thousandths.

Ex 2.5 Class 7 Maths Question 7.
Dinesh went from place A to place B and from there to place C. A is 7.5 km from B and B is 12.7 km from C. Ayub went from place A to place D and from there to place C. D is 9.3 km from A and C is 11.8 km from D. Who travelled more and by how much?

Solution:

Ex 2.5 Class 7 Maths Question 8.
Shyama bought 5 kg 300 g apples and 3 kg 250 g mangoes. Sarala bought 4 kg 800 g oranges and 4 kg 150 g bananas. Who bought more fruits?
Solution:
Shyama bought apples = 5 kg 300 g
Shyama bought mangoes = 3 kg 250 g
Toal fruits bought by Shyama
= 5 kg 300 g + 3 kg 250 g
= 5.300 kg + 3.250 kg
= 8.550 kg

Sarala bought oranges = 4 kg 800 g
Sarala bought banana = 4 kg 150 g
Total fruits bought by Sarala
= 4 kg 800 g + 4 kg 150 g
= 4.800 kg +4.150 kg
= 8.950 kg

Since, 8.950 > 8.550
∴ Sarala bought more fruits.

Ex 2.5 Class 7 Maths Question 9.
How much less is 28 km than 42.6 km?
Solution:
Required difference = 42.6 km – 28 km = 14.6 km

Ex 2.6 Class 7 Maths Question 1.
Find :
(i) 0.2 × 6
(ii) 8 × 46
(iii) 2.71 × 5
(iv) 20.1 × 4
(v) 0.05 × 7
(vi) 211.02 × 4
(vii) 2 × 0.86
Solution:

Ex 2.6 Class 7 Maths Question 2.
Find the area of rectangle whose length is 5.7 cm and breadth is 3 cm.
Solution:

Ex 2.6 Class 7 Maths Question 3.
Find :

1. 1.3 × 10
2. 36.8 × 10
3. 15a 7 × 10
4. 168.07 × 10
5. 31.1 × 100
6. 156.1 × 100
7. 3.62 × 100
8. 43.07 × 100
9. 0.5 × 10
10. 0.08 × 10
11. 0.9 × 100
12. 0.03 × 1000

Solution:

1. 1.3 × 10 = 13
2. 36.8 × 10 = 368
3. 153.7 × 10 = 1537
4. 168.07 × 10 = 1680.7
5. 31.1 × 100 = 3110
6. 156.1 × 100 = 15610
7. 3.62 × 100 = 362
8. 43.07 × 100 = 4307
9. 0.5 × 10 = 5
10. 0.08 × 10 = 0.8
11. 0.9 × 100 = 90
12. 0.03 × 1000 = 30

Ex 2.6 Class 7 Maths Question 4.
A two wheeler covers a distance of 55.3 km in one litre of petrol. How much distance will it cover in 10 litres of petrol?
Solution:
Distance covered in one litre of petrol = 55.3 km
Distance covered in 10 litres of petrol = (55.3 × 10) km = 553 km

Ex 2.6 Class 7 Maths Question 5.
Find:
(i) 2.5 × 0.3
(ii) 0.1 × 51.7
(iii) 0.2 × 316.8
(iv) 1.3 × 3.1
(v) 0.5 × 0.05
(vi) 11.2 × 0.15
(vii) 1.07 × 0.02
(viii) 10.05 × 1.05
(ix) 101.01 × 0.01
(x) 100.01 × 1.1
Solution:

Ex 2.7 Class 7 Maths Question 1.
Find :
(i) 0.4 ÷ 2
(ii) 0.35 ÷ 5
(iii) 2.48 ÷ 4
(iv) 65.4 ÷ 6
(v) 651.2 ÷ 4
(vi) 14.49 ÷ 7
(vii) 3.96 ÷ 4
(viii) 0.80 ÷ 5
Solution:

Ex 2.7 Class 7 Maths Question 2.
Find :

1. 48 ÷ 10
2. 52.5 ÷ 10
3. 0.7 ÷ 10
4. 361 ÷ 10
5. 697 ÷ 10
6. 272.23 ÷ 10
7. 0.56 ÷ 10

Solution:

1. 4.8 ÷ 10 = 0.48
2. 52.5 ÷ 10 = 5.25
3. 0.7 ÷ 10 = 0.07
4. 33.1 ÷ 10 = 3.31
5. 272.23 ÷ 10 = 27.223
6. 0.56 ÷ 10 = 0.056
7. 3.97 ÷ 10 = 0.397

Ex 2.7 Class 7 Maths Question 3.
Find :

1. 2.7 ÷ 100
2. 0.3 ÷ 100
3. 0.78 ÷ 100
4. 432.6 ÷ 100
5. 23.6 ÷ 100
6. 98.53 ÷ 100

Solution:

1. 2.7 ÷ 100 = 0.027
2. 0.3 ÷ 100 = 0.003
3. 0.78 ÷ 100 = 0.0078
4. 432.6 ÷ 100 = 4.326
5. 23.6 ÷ 100 = 0.236
6. 98.53 ÷ 100 = 0.9853

Ex 2.7 Class 7 Maths Question 4.
Find :

1. 7.9 ÷ 1000
2. 26.3 ÷ 1000
3. 38.53 ÷ 1000
4. 128.9 ÷ 1000
5. 0.5 ÷ 1000

Solution:

1. 7.9 ÷ 1000 = 0.0079
2. 26.3 ÷ 1000 = 0.0263
3. 38.53 ÷ 1000 0.03853
4. 128.9 ÷ 1000 = 0.1289
5. 0.5 ÷ 1000 = 0.0005

Ex 2.7 Class 7 Maths Question 5.
Find :
(i) 7 ÷ 3.5
(ii) 36 ÷ 0.2
(iii) 3.25 ÷ 0.5
(iv) 30.94 ÷ 0.7
(v) 0.5 ÷ 0.25
(vi) 7.75 ÷ 0.25
(vii) 76.5 ÷ 0.15
(viii) 37.8 ÷ 1.4
(ix) 2.73 ÷ 1.3
Solution:

Ex 2.7 Class 7 Maths Question 6.
A vehicle covers a distance of 43.2 km in 2.4 litres of petrol. How much distance will it cover in one litre of petrol?
Solution:
Distance covered in 2.4 litres of petrol = 43.2 km
Distance covered in 1 litre of petrol = (43.2 ÷ 2.4) km