Class VIII

Which smallest number should be added to 80 so as to make it a perfect square ?
  1. 2
  2. 3
  3. 1
  4. 4
The square of 1.2 is
  1. 144
  2. 1.44
  3. 14.4
  4. 2.4
How many natural numbers lie between 9² and 10²?
  1. 15
  2. 19
  3. 18
  4. 17
The square root of 6400 is
  1. 80
  2. 81
  3. 32
  4. 23
Which is the greatest three-digit perfect square?
  1. 999
  2. 961
  3. 962
  4. 971
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