Class IX

Solve the following problem using estimation. 569 x 75
  1. 40,000
  2. 42,000
  3. 46,000
  4. 48,000
What is the correct estimation for the following problem? 7,495 x 1,502
  1. 7,000 x 1,000
  2. 7,000 x 2,000
  3. 8,000 x 1,000
  4. 8,000 x 1,500
A ball is dropped from a height of 20 m above the surface of water in a lake. The refractive index of water is 4/3. A fish inside the lake, in the line of fall of the ball, is looking at the ball. At an instant, when the ball is 12.8 m above the water surface, the fish sees the speed of the ball as [Take g = 10 m/s2.]
  1. 9 m/s
  2. 12 m/s
  3. 16 m/s
  4. 21.23 m/s
Estimate the following problem. What is the product? 555 x 85
  1. 50,000
  2. 54,000
  3. 55,000
  4. 56,000
/3 of the marks obtained by 'A' in Maths are same as the marks obtained by him in English. If total number of marks obtained by him in both the subjects is 160, then marks obtained by him in English are
  1. 40
  2. 30
  3. 50
  4. None of these
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