## 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

Solution:

[100 paise = 1 rupees]

(a) 5 paise

= 5 / 100 rupees

= Rupess 0.05

(b) 75 paise

= 75 / 100 rupees

= Rupees 0.75

(c) 20 paise

= 20 / 100 rupees

= Rupees 0.20

(d) 50 rupees 90 paise

= [(50 + 90 / 100)] rupees

= Rupees 50.90

(e) 725 paise

= 725 / 100 rupees

= Rupees 7.25

## EX 8.4 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

Solution:

[100 cm = 1 metre]

(a) 15 cm

= 15 / 100 m

= 0.15 m

(b) 6 cm

= 6 / 100 m

= 0.06 m

(c) 2 m 45 cm

= [(2 + 45 / 100)] m

= 2.45 m

(d) 9 m 7 cm

= [(9 + 7 / 100)] m

= 9.07 m

(e) 419 cm = 419 / 100 m

= 4.19 m

## EX 8.4 QUESTION 3.

Express as cm using decimals

(a) 5 mm

(b) 60 mm

(c) 164 mm

(d) 9 cm 8 mm

(e) 93 mm

Solutions:

[10 mm = 1 cm]

(a) 5 mm = 5 / 10 cm

= 0.5 cm

(b) 60 mm = 60 / 10 cm

= 6.0 cm

(c) 164 mm = 164 / 10 cm

= 16.4 cm

(d) 9 cm 8 mm = [(9 + 8 / 10)] cm

= 9.8 cm

(e) 93 mm = 93 / 10 cm

= 9.3 cm

## EX 8.4 QUESTION 4.

Express as km using decimals.

(a) 8 m

(b) 88 m

(c) 8888 m

(d) 70 km 5 m

Solutions:

[1000 metres = 1 km]

(a) 8 m = 8 / 1000 km

= 0.008 km

(b) 88 m = 88 / 1000 km

= 0.088 km

(c) 8888 m = 8888 / 1000 km

= 8.888 km

(d) 70 km 5 m = [(70 + 5 / 1000)] km

= 70.005 km

## EX 8.4 QUESTION 5.

Express as kg using decimals.

(a) 2 g

(b) 100 g

(c) 3750 g

(d) 5 kg 8 g

(e) 26 kg 50 g

Solutions:

[1000 grams = 1 kg]

(a) 2 g = 2 / 1000 kg

= 0.002 kg

(b) 100 g = 100 / 1000 kg

= 0.1 kg

(c) 3750 g = 3750 / 1000 kg

= 3.750 kg

(d) 5 kg 8 g = [(5 + 8 / 1000)] kg

= 5.008 kg

(e) 26 kg 50 g = [(20 + 50 / 1000)] kg

= 26.050 kg

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