**NCERT Answers for Class 7 Maths**

Chapter 2 Fractions and Decimals Exercise 2.7

Chapter 2 Fractions and Decimals Exercise 2.7

Chapter 2 Exercise 2.1 |

**Page 52**

**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**

**(i) 0.4 ÷ 2**

**Answer**

= (4/10) ÷ 2

= (4/10) × (1/2)

= (2/10) × (1/1)

= (2/10)

On dividing a decimal by 10, the decimal point is shifted to the left by one place.

= 0.2

**(ii) 0.35 ÷ 5**

**Answer**

= (35/100) ÷ 5

= (35/100) × (1/5)

= (7/100) × (1/1)

= (7/100)

On dividing a decimal by 100, the decimal point is shifted to the left by two places.

= 0.07

**(iii) 2.48 ÷ 4**

**Answer**

= (248/100) ÷ 4

= (248/100) × (1/4)

= (62/100) × (1/1)

= (62/100)

On dividing a decimal by 100, the decimal point is shifted to the left by two places.

= 0.62

**(iv) 65.4 ÷ 6**

**Answer**

= (654/10) ÷ 6

= (654/10) × (1/6)

= (109/10) × (1/1)

= (109/10)

On dividing a decimal by 10, the decimal point is shifted to the left by one place.

= 10.9

**(v) 651.2 ÷ 4**

**Answer**

= (6512/10) ÷ 4

= (6512/10) × (1/4)

= (1628/10) × (1/1)

= (1628/10)

On dividing a decimal by 10, the decimal point is shifted to the left by one place.

= 162.8

**(vi) 14.49 ÷ 7**

**Answer**

= (1449/100) ÷ 7

= (1449/100) × (1/7)

= (207/100) × (1/1)

= (207/100)

On dividing a decimal by 100, the decimal point is shifted to the left by two places.

= 2.07

**(vii) 3.96 ÷ 4**

**Answer**

= (396/100) ÷ 4

= (396/100) × (1/4)

= (99/100) × (1/1)

= (99/100)

On dividing a decimal by 100, the decimal point is shifted to the left by two places.

= 0.99

**(viii) 0.80 ÷ 5**

**Answer**

= (80/100) ÷ 5

= (80/100) × (1/5)

= (16/100) × (1/1)

= (16/100)

On dividing a decimal by 100, the decimal point is shifted to the left by two places.

= 0.16

2. Find:

(i) 4.8 ÷ 10 (ii) 52.5 ÷ 10 (iii) 0.7 ÷ 10 (iv) 33.1 ÷ 10

(v) 272.23 ÷ 10 (vi) 0.56 ÷ 10 (vii) 3.97 ÷10

**Answer**

On dividing a decimal by 10, the decimal point is shifted to the left by one place.

= 4.8 ÷ 10

= (4.8/10)

= 0.48

**(ii) 52.5 ÷ 10**

**Answer**

On dividing a decimal by 10, the decimal point is shifted to the left by one place.

= 52.5 ÷ 10

= (52.5/10)

= 5.25

**(iii) 0.7 ÷ 10**

**Answer**

On dividing a decimal by 10, the decimal point is shifted to the left by one place.

= 0.7 ÷ 10

= (0.7/10)

= 0.07

**(iv) 33.1 ÷ 10**

**Answer**

On dividing a decimal by 10, the decimal point is shifted to the left by one place.

= 33.1 ÷ 10

= (33.1/10)

= 3.31

**(v) 272.23 ÷ 10**

**Answer**

On dividing a decimal by 10, the decimal point is shifted to the left by one place.

= 272.23 ÷ 10

= (272.23/10)

= 27.223

**(vi) 0.56 ÷ 10**

**Answer**

On dividing a decimal by 10, the decimal point is shifted to the left by one place.

= 0.56 ÷ 10

= (0.56/10)

= 0.056

**(vii) 3.97 ÷10**

**Answer**

On dividing a decimal by 10, the decimal point is shifted to the left by one place.

= 3.97 ÷ 10

= (3.97/10)

= 0.397

3. Find:

(i) 2.7 ÷ 100 (ii) 0.3 ÷ 100 (iii) 0.78 ÷ 100

(iv) 432.6 ÷ 100 (v) 23.6 ÷100 (vi) 98.53 ÷ 100

**(i) 2.7 ÷ 100**

**Answer**

On dividing a decimal by 100, the decimal point is shifted to the left by two places.

= 2.7 ÷ 100

= (2.7/100)

= 0.027

**(ii) 0.3 ÷ 100**

**Answer**

On dividing a decimal by 100, the decimal point is shifted to the left by two places.

= 0.3 ÷ 100

= (0.3/100)

= 0.003

**(iii) 0.78 ÷ 100**

**Answer**

On dividing a decimal by 100, the decimal point is shifted to the left by two places.

= 0.78 ÷ 100

= (0.78/100)

= 0.0078

**(iv) 432.6 ÷ 100**

**Answer**

On dividing a decimal by 100, the decimal point is shifted to the left by two places.

= 432.6 ÷ 100

= (432.6/100)

= 4.326

**(v) 23.6 ÷100**

**Answer**

On dividing a decimal by 100, the decimal point is shifted to the left by two places.

= 23.6 ÷ 100

= (23.6/100)

= 0.236

**(vi) 98.53 ÷ 100**

**Answer**

On dividing a decimal by 100, the decimal point is shifted to the left by two places.

= 98.53 ÷ 100

= (98.53/100)

= 0.9853

**4. Find:
(i) 7.9 ÷ 1000 (ii) 26.3 ÷ 1000 (iii) 38.53 ÷ 1000
(iv) 128.9 ÷ 1000 (v) 0.5 ÷ 1000**

**(i) 7.9 ÷ 1000**

**Answer**

On dividing a decimal by 1000, the decimal point is shifted to the left by three places.

= 7.9 ÷ 1000

= (7.9/1000)

= 0.0079

**(ii) 26.3 ÷ 1000**

**Answer**

On dividing a decimal by 1000, the decimal point is shifted to the left by three places.

= 26.3 ÷ 1000

= (26.3/1000)

= 0.0263

**(iii) 38.53 ÷ 1000**

**Answer**

On dividing a decimal by 1000, the decimal point is shifted to the left by three places.

= 38.53 ÷ 1000

= (38.53/1000)

= 0.03853

**(iv) 128.9 ÷ 1000**

**Answer**

On dividing a decimal by 1000, the decimal point is shifted to the left by three places.

= 128.9 ÷ 1000

= (128.9/1000)

= 0.1289

**(v) 0.5 ÷ 1000**

**Answer**

On dividing a decimal by 1000, the decimal point is shifted to the left by three places.

= 0.5 ÷ 1000

= (0.5/1000)

= 0.0005

**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**

**(i) 7 ÷ 3.5**

**Answer**

= 7 ÷ (35/10)

= 7 × (10/35)

= 1 × (10/5)

= 2

**(ii) 36 ÷ 0.2**

**Answer**

= 36 ÷ (2/10)

= 36 × (10/2)

= 18 × 10

= 180

**(iii) 3.25 ÷ 0.5**

**Answer**

= (325/100) ÷ (5/10)

= (325/100) × (10/5)

= (325 × 10)/ (100 × 5)

= (65 × 1)/ (10 × 1)

= 65/10

= 6.5

**(iv) 30.94 ÷ 0.7**

**Answer**

= (3094/100) ÷ (7/10)

= (3094/100) × (10/7)

= (3094 × 10)/ (100 × 7)

= (442 × 1)/ (10 × 1)

= 442/10

= 44.2

**(v) 0.5 ÷ 0.25**

**Answer**

= (5/10) ÷ (25/100)

= (5/10) × (100/25)

= (5 × 100)/ (10 × 25)

= (1 × 10)/ (1 × 5)

= 10/5

= 2

**(vi) 7.75 ÷ 0.25**

**Answer**

= (775/100) ÷ (25/100)

= (775/100) × (100/25)

= (775 × 100)/ (100 × 25)

= (155 × 1)/ (1 × 5)

= (31 × 1)/ (1 × 1)

= 31

**(vii) 76.5 ÷ 0.15**

**Answer**

= (765/10) ÷ (15/100)

= (765/10) × (100/15)

= (765 × 100)/ (10 × 15)

= (51 × 10)/ (1 × 1)

= 510

**(viii) 37.8 ÷ 1.4**

**Answer**

= (378/10) ÷ (14/10)

= (378/10) × (10/14)

= (378 × 10)/ (10 × 14)

= (27 × 1)/ (1 × 1)

= 27

**(ix) 2.73 ÷ 1.3**

**Answer**

= (273/100) ÷ (13/10)

= (273/100) × (10/13)

= (273 × 10)/ (100 × 13)

= (21 × 1)/ (10 × 1)

= 21/10

= 2.1

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?

**Answer**

Total distance covered by vehicle in 2.4 litres of petrol = 43.2 km

Distance covered in 1 litre of petrol = 43.2 ÷ 2.4

= (432/10) ÷ (24/10)

= (432/10) × (10/24)

= (432 × 10)/ (10 × 24)

= (36 × 1)/ (1 × 2)

= (18 × 1)/ (1 × 1)

= 18 km

∴ Total distance covered in 1 liter of petrol is 18 km.

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