Problem

4 x 103 + 2 x 102 = _____
Procedure
  1. Rewrite one of the terms so that the exponents are equal.
 4 x 103 = 40 x 102
  1. Complete the addition
 40 x 102 + 2 x 102 = 42 x 102
Solution

4 x 103 + 2 x 102 = 42 x 102 or 4.2 x 103

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