Ncert Solutions For Class 6 Maths Ex 8.4

Ncert Solutions For Class 6 Maths Chapter 8 Ex 8.4

Q1. Express in the form of rupees using decimal places.

  1. 6 paise
  2. 85 paise
  3. 30 paise
  4. 60 rupees 40 paise
  5. 625 paise
  6. 450 paise

Answer

We know that, 100 paise is equal to 1 rupee.

  1. 6 paise = \(\frac{6}{100}\) rupees = Re 0.06
  2. 85 paise = \(\frac{85}{100}\) rupees = Re 0.85
  3. 30 paise = \(\frac{30}{100}\) rupees = Re 0.30
  4. 60 rupees 40 paise = \(60 + \frac{40}{100}\) = Re 60.40
  5. 625 paise = (\(\frac{625}{100}\)) rupees = Re 6.25
  6. 450 paise = \(\frac{450}{100}\) rupees = Re 4.50

 

Q2. Express the following in the form of metres using decimal places.

  1. 16 cm
  2. 5 cm
  3. 3 m 25 cm
  4. 5 m 8 cm
  5. 625 cm
  6. 213 cm

Answer

We know that, 100 cm is equal to 1 m.

  1. 16 cm = \(\frac{16}{100}\) m = 0.16 m
  2. 5 cm = \(\frac{5}{100}\) m = 0.05 m
  3. 3 m 25 cm = (\(3 + \frac{25}{100}\)) m = 3.25 m
  4. 5 m 8 cm = (\(5 + \frac{8}{100}\)) m = 5.08 m
  5. 625 cm = \(\frac{625}{100}\) m = 6.25 m
  6. 213 cm = \(\frac{213}{100}\) m = 2.13 m

 

Q3. Express the following in the form of centimetres using decimal places.

  1. 6 mm
  2. 50 mm
  3. 155 mm
  4. 10 cm 8 mm
  5. 98 mm
  6. 289 mm

Answer

We know that, 10 mm is equal to 1 cm.

  1. 6 mm = \(\frac{6}{10}\) cm = 0.6 cm
  2. 50 mm = \(\frac{50}{10}\) cm = 5.0 cm
  3. 155 mm = \(\frac{155}{10}\) cm = 15.5 cm
  4. 10 cm 8 mm = \(10 + \frac{8}{10}\) cm = 10.8 cm
  5. 98 mm = \(\frac{98}{10}\) cm = 9.8 cm
  6. 289 mm = \(\frac{289}{10}\) cm = 28.9 cm

 

Q4. Express the following in the form of kilometres using decimal places.

  1. 9 m
  2. 78 m
  3. 825 m
  4. 9456 m
  5. 25 km 726 m

Answer

We know that, 1000 m is equal to 1 km.

  1. 9 m = \(\frac{9}{1000}\) km = 0.009 km
  2. 78 m = \(\frac{78}{1000}\) km = 0.078 km
  3. 825 m = \(\frac{825}{1000}\) km = 0.825 km
  4. 9456 m = \(\frac{9456}{1000}\) km = 9.456 km
  5. 25 km 726 m = (25 + \(\frac{726}{1000}\)) km = (25 + 0.726) km = 25.726 km

 

Q5. Express the following in the form of kilograms using decimal places.

  1. 5 g
  2. 56 g
  3. 654 g
  4. 5452 g
  5. 15 kg 348 g
  6. 54681 g

Answer

We know that, 1000 g is equal to 1 kg.

  1. 5 g = \(\frac{5}{1000}\) kg = 0.005 kg
  2. 56 g = \(\frac{56}{1000}\) kg = 0.056 kg
  3. 654 g = \(\frac{654}{1000}\) kg = 0.654 kg
  4. 5452 g = \(\frac{5452}{1000}\) kg = 5.452 kg
  5. 15 kg 348 g = (15 + \(\frac{348}{1000}\)) kg = (15 + 0.348) kg = 15.348 kg
  6. 54681 g = \(\frac{54681}{1000}\) kg = 54.681 kg