Multiples and sub-multiples, abbreviations and indices

Explanation of question 4

4500 is equal to

  1. 4.5 x 10-6
  2. 4.5 x 10-3
  3. 4.5 x 103
  4. 4.5 x 106

The answer is :- 3

4.5 x 103 = 4.5 x 1000 = 4500.

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