Class IX

Solve the following problem using estimation. 2,556 x 446
  1. 104,000
  2. 1,500,000
  3. 1,200,000
  4. 12,000
Find the product of the following problem using estimation. 6,444 x 980
  1. 6,000
  2. 60,000
  3. 600,000
  4. 6,000,000
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
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