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To convert a number to scientific notation:

  1. write out the number starting with the first non-zero digit and continue until the last non-zero digit;
  2. put the decimal point after the first digit;
  3. count how many digits the decimal point needs to move to get back to where it was originally (if there was no decimal point as the number was a whole number it was "hiding" after the ones-digit, the last digit);
  4. if the decimal point need to move left make this count negative;
  5. write ×10 to the power of this count after the number written in step 2.

For 0.0000000000073:

  1. 73
  2. 7.3
  3. move decimal place 12 place to the left
  4. It's to the left, so count becomes -12
  5. 7.3 × 10⁻¹²

0.0000000000073 = 7.3 × 10⁻¹²

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7y ago

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