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Significant figures and scientific notation

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Define scientific notation

In scientific notation a number is expressed as some power of ten multiplied by a number between 1 and 10.

 

What is significant figure?

A significant figure is one,which is known to be reasonable and reliable.

or

All the accurately known digits and first doubtful digit in an expression are called significant figures.

Significant figures rules

  • Digits other than zero are always significant.
  • Zeroes between significant digits are also significant.
  • Zero on the left of the significant figures is not significant.
  • Zero on the right of significant figure is not significant.

Zero on the right of a fractional number is significant

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