Multiples and sub-multiples, abbreviations and indices

Explanation of question 7

9 x 106
3 x 103 is equal to

  1. 3 x 102
  2. 3 x 103
  3. 3 x 109
  4. 3 x 1018

The answer is :- 2

9 / 3= 3. Subtract indices, i.e. 103

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