Find the product of 0.0409 and 0.0021 leaving your answer in the standard form

Find the product of 0.0409 and 0.0021 leaving your answer in the standard form
  • A.
    8.6 x 10-6
  • B.
    8.6 x 105
  • C.
    8.6 x 10-4
  • D.
    8.6 x 105
Correct Answer: Option B
Explanation

0.0409 x 0.0021 = 409 x 10-4 x 21 x 10-4
= 409 x 21 x 10-4-4
= 8589 x 10-8
= 8.589 x 103 x 10-8
= 8.6 x 103 – 8
= 8.6 x 10-5

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