Wednesday, 9 May 2012

CBSE Class 6th ( VI) Mathematics Chapter 8. Decimals: Exercise 8.4

1. Express as rupees using decimals.
  1. 5 paise
  2. 75 paise
  3. 20 paise
  4. 50 rupees 90 paise
  5. 725 paise


Answer:
5
(a). 5 paise = Re
= Re 0.05
100
75
(b). 75 paise = Re
= Re 0.75
100
20
(c). 20 paise = Re
= Re 0.20
100
50
(d). 50 paise = Re
= Re 0.50
100
725
(e). 725 paise = Re
= Re 7.25
100
2. Express as metres using decimals.
  1. 15 cm
  2. 6 cm
  3. 2 m 45 cm
  4. 9 m 7 cm
  5. 419 cm
Answer:
15
(a). 15 cm =
m = 0.15 m
100
6
(b). 6 cm =
m = 0.06 m
100
245
(c). 2m 45 cm =
m = 2.45 m
100
97
(d). 9m 7cm =
m = 0.97 m
100
419
(e). 419 cm =
m = 4.19 m
100
3. Express as cm using decimals.
  1. 5 mm
  2. 60 mm
  3. 164 mm
  4. 9 cm 8 mm
  5. 93 mm
Answer:
15
(a). 5 mm =
cm = 0.5 cm
100
60
(b). 60 mm =
cm = 6.0 cm
100
164
(c). 164 mm =
cm = 16.4 cm
100
98
(d). 9 cm 8 mm =
cm = 9.8 cm
100
93
(e). 93 mm =
cm = 9.3 cm
100
4. Express as km using decimals.
  1. 8 m
  2. 88 m
  3. 8888 m
  4. 70 km 5 m
Answer:
8
(a). 8 m =
km = 0.008 km
1000
88
(b). 88 m =
km = 0.088 km
1000
8888
(c). 8888 m =
km = 8.888 km
1000
70005
(d). 70 km 5 m = 70 ×1000 + 5 = 70005 m =
km = 70.005 km
1000
5. Express as kg using decimals.
  1. 2 g
  2. 100 g
  3. 3750 g
  4. 5 kg 8 g
  5. 26 kg 50 g
Answer:
2
(a). 2 g =
kg = 0.002 kg
1000
100
(b). 100 g =
kg = 0.1 kg
1000
3750
(c). 3750 g =
kg = 3.750 kg
1000
5008
(d). 5 kg 8 g = 5 × 1000 + 8 g = 1008 g =
kg = 5.008 kg
1000
2
(e). 26 kg 50 g = 26 × 1000 + 50 g = 26050 g =
kg = 26.05 kg
1000

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