# NCERT Solutions for Class 6 Maths Chapter 8 Decimals Ex 8.4

These NCERT Solutions for Class 6 Maths Chapter 8 Decimals Ex 8.4 Questions and Answers are prepared by our highly skilled subject experts.

## NCERT Solutions for Class 6 Maths Chapter 8 Decimals Ex 8.4

Question 1.
Express as rupees using decimals:
(a) 5 paise
(b) 75 paise
(c) 20 paise
(d) 50 rupees 90 paise
(e) 725 paise
(a) ∵ 1 paisa = ₹ $$\frac { 1 }{ 100 }$$
∴ 5 paise = $$\frac { 1 }{ 100 }$$ × 5 = ₹ 0.05

(b) ∵ 1 paisa = $$\frac { 1 }{ 100 }$$
∴ 75 paise = $$\frac { 1 }{ 100 }$$ × 75 = ₹ 0.75

(c) ∵ 1 paisa = X $$\frac { 1 }{ 100 }$$
∴ 20 paise = $$\frac { 1 }{ 100 }$$ × 20 = ₹ 0.2

(d) ∵ 1 paisa = X $$\frac { 1 }{ 100 }$$
∴ ₹ 50 + 90 paise
= 50 + $$\frac { 1 }{ 100 }$$ × 90 = ₹ 50.90

(e) ∵ 1 paisa = ₹ $$\frac { 1 }{ 100 }$$
∴ 725 paise = $$\frac { 1 }{ 100 }$$ × 725
= ₹ 7.25

Question 2.
Express as metres using decimals:
(a) 15 cm
(b) 6 cm
(c) 2 m 45 cm
(d) 9 m 7 cm
(e) 419 cm
(a) ∵ 1 cm = $$\frac { 1 }{ 100 }$$ m
∴ 15 cm = $$\frac { 1 }{ 100 }$$ × 15 = 0.15 m 100
(b) ∵ 1 cm = $$\frac { 1 }{ 100 }$$ m
∴ 6 cm = $$\frac { 1 }{ 100 }$$ × 6 = 0.06 m

(c) ∵ 1 cm = $$\frac { 1 }{ 100 }$$ m
∴ 2 m 45 cm = 2 + $$\frac { 1 }{ 100 }$$ × 45
= 2.45 m

(d) ∵ 1 cm = $$\frac { 1 }{ 100 }$$ m
∴ 9 m 7 cm = 9 x $$\frac { 1 }{ 100 }$$ × 9 = 9.07 m

(e) ∵ 1 cm = $$\frac { 1 }{ 100 }$$ m
∴ 419 = $$\frac { 1 }{ 100 }$$ × 419 = 4.19 m

Question 3.
Express as cm using decimals:
(a) 5 mm
(b) 60 mm
(c) 164 mm
(d) 9 cm 8 mm
(e) 93 mm
(a) ∵ 1mm = $$\frac { 1 }{ 10 }$$ cm
5mm = $$\frac { 1 }{ 10 }$$ × 5 = 0.5 cm

(b) ∵ 1 mm = $$\frac { 1 }{ 10 }$$ cm 10
∴ 60 mm = $$\frac { 1 }{ 10 }$$ × 60 = 6 cm

(c) ∵ 1 mm = $$\frac { 1 }{ 10 }$$ cm
∴ 164 mm = $$\frac { 1 }{ 10 }$$ × 164 = 16.4 cm

(d) ∵ 1 mm = $$\frac { 1 }{ 10 }$$ cm
∴ 9 cm 8 mm = 9 + $$\frac { 1 }{ 10 }$$ × 8
= 9 + 0.8 cm = 9.8 cm

(e) ∵ 1 mm = $$\frac { 1 }{ 10 }$$ cm
∴ 93 mm = $$\frac { 1 }{ 10 }$$ × 93 cm

Question 4.
Express as km using decimals:
(a) 8m
(b) 88 m
(c) 8888 m
(d) 70 km 5 m
(a) ∵ 1 m = $$\frac { 1 }{ 1000 }$$ km
∴ 8m = $$\frac { 1 }{ 1000 }$$ × 8 = 0.008 km

(b) ∵ 1 m = $$\frac { 1 }{ 1000 }$$ km
∴ 88 m: 1 $$\frac { 1 }{ 1000 }$$ × 88 = 0.088 km

(c) ∵ 1 m = $$\frac { 1 }{ 1000 }$$ km
∴ 8888m = $$\frac { 1 }{ 1000 }$$ × 88 = 8.888km

(d) ∵ 1m = $$\frac{1}{100}$$km
∴ 70km 5m = 70 + $$\frac{1}{100}$$ × 5
= 70.005 km

Question 5.
Express as kg using decimals:
(a) 2g
(b) 100g
(c) 3750 g
(d) 5 kg 8 g
(e) 26kg 50g
(a) 1 g = $$\frac{1}{1000}$$ kg
∴ 2g = $$\frac{1}{1000}$$ × 2 = 0.002kg

(b) ∵ 1g = $$\frac{1}{1000}$$ kg
∴ 100g= $$\frac{1}{1000}$$ × 100 = 0.1 kg

(c) ∵ 1g = $$\frac{1}{1000}$$ kg
∴ 3750g = $$\frac{1}{1000}$$ × 3750 = 3.750kg

(d) ∵ 1g = $$\frac{1}{1000}$$ kg
∴ 5kg50g = 5 + $$\frac{1}{1000}$$ × 8
= 5.008kg

(e) ∵ 1g = $$\frac{1}{1000}$$ kg
∴ 26kg 50g = 26 + $$\frac{1}{1000}$$ × 50
= 26.050kg

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