Class 7 Maths

Decimals

Exercise 2.6

Question 1:

  1. `0.2 xx 6`
  2. `8 xx 4.6`
  3. `2.71 xx 5`
  4. `20.1 xx 4`
  5. `0.05 xx 7`
  6. `211.02 xx 4`
  7. `2 xx 0.86`

Answer: (a) 1.2, (b) 36.8, (c) 13.55, (d) 80.4, (e) 0.35, (f) 844.08, (g) 1.72

Question 2: Find the area of rectangle whose length is 5.7 cm and breadth is 3 cm.

Answer: Area of rectangle = length x breadth
`= 5.7 cm xx 3 cm = 17.1  sq  cm`

Question 3: Find the value of following:

  1. `1.3 xx 10`
  2. `36.8 xx 10`
  3. `153.7 xx 10`
  4. `168.07 xx 10`

Answer: (a) 13, (b) 368, (c) 1537, (d) 1680.7

  1. `31.1xx100`
  2. `156.1xx100`
  3. `3.62xx100`
  4. `43.07xx100`
  5. `0.5xx10`
  6. `0.08xx10`
  7. `0.9xx100`
  8. `0.03xx1000`

Answer: (a) 3110, (b) 15610, (c) 362, (d) 4307, (e) 5,(f) 0.8, (f) 90, (h) 30

Question 4: A two wheeler covers a distance of 55.3 km in one litre of petrol. How much distance will it cover in 10 litres of petrol?

Answer: Total distance `= 55.3 km \xx 10 = 553 km`

Question 5: Find the value of following:

  1. `2.5 xx 0.3`
  2. `0.1 xx 51.7`
  3. `0.2 xx 316.8`
  4. `1.3 xx 3.1`
  5. `0.5 xx 0.05
  6. `11.2 xx 0.15`
  7. `1.07 xx 0.02`
  8. `10.05 xx 1.05`
  9. `101.01 xx 0.01`
  10. `100.01 xx 1.1`

Answer: (a) 0.75, (b) 5.17, (c) 63.36, (d) 4.03, (e) 0.025, (f) 1.680, (g) 0.0214, (h) 10.5525, (i) 1.0101, (j) 110.011