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Simplify 0.000215 x 0.000028 and express your answer in standard form

Simplify 0.000215 x 0.000028 and express your answer in standard form
  • A.
    6.03 x 109
  • B.
    6.02 x 109
  • C.
    6.03 x 10-9
  • D.
    6.02 x 10-9
Correct Answer: Option D
Explanation

0.000215215 x 0.000028
= 215 x 10-4 x 28 x 10-4
= 215 x 28 x 10-6-6
= 6020 x 10-12
= 6.020 x 103 x 10-12
= 6.02 x 103 – 12
= 6.02 x 10-9

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