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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