Page 169 - Start Up Mathematics_6

1,000
(c) 1,000 cm = m = 10 m
100
54
(d) 6 m 54 cm = 6 m + m = 6 m + 0.54 m = 6.54 m
100

Example 22: Express as cm using decimals.
(a) 7 mm (b) 86 mm (c) 174 mm (d) 23 cm 6 mm
7 86
Solution: (a) 7 mm = cm = 0.7 cm (b) 86 mm = cm = 8.6 cm
10 10
174
(c) 174 mm = cm = 17.4 cm
10
6
(d) 23 cm 6 mm = 23 cm + cm = 23 cm + 0.6 cm = 23.6 cm
10
Example 23: Express as km using decimals.

(a) 7 m (b) 1,234 m (c) 85 km 5 m
7 1,234
Solution: (a) 7 m = km = 0.007 km (b) 1,234 m = km = 1.234 km
1,000 1,000

5
(c) 85 km 5 m = 85 km + km = 85 km + 0.005 km = 85.005 km
1,000
Example 24: Express as kg using decimals.

(a) 3 g (b) 8,750 g (c) 8 kg 5 g (d) 37 kg 50 g
3 8,750
Solution: (a) 3 g = kg = 0.003 kg (b) 8,750 g = kg = 8.750 kg
1,000 1,000
5
(c) 8 kg 5 g = 8 kg + kg = 8 kg + 0.005 kg = 8.005 kg
1,000
50
(d) 37 kg 50 g = 37 kg + kg = 37 kg + 0.050 kg = 37.050 kg
1,000
Example 25: Nusrat’s grandmother gave her ` 20.50 and her mother gave her ` 30.40. Find the
total amount given to Nusrat.

Solution: Money given by Nusrat’s grandmother = ` 20.50 ` 20.50
+ ` 30.40
Money given by Nusrat’s mother = ` 30.40 ` 50.90

Total money given to Nusrat = ` 50.90
Example 26: Neha travelled 18 km 343 m by bus, 4 km 15 m by scooter and finally walked
208 m to reach the stadium for her basketball match. What is the total distance covered
by her?
343
Solution: Distance travelled by bus = 18 km + km = 18.343 km
1,000
15
Distance travelled by scooter = 4 km + km = 4.015 km
1,000

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