# the number 1.050 × 109 has how many significant figures?

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## How many significant figures are in 1.050 x 10^9?

In math, physics, chemistry, and biology subjects, we are sometimes asked to write our answers in scientific notation with a certain number of significant figures. In order to do this, we have to follow the rules in significant figures.

We are given the scientific notation 1.050×109.

We want to know the number of significant figures of the given number. So, we have:

**Solution:**

The given number is a scientific notation. Thus, all the digits are considered as significant figures.

Therefore, the given number has 4 significant figures.

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## What are significant figures?

Significant figures are all numbers that add to the meaning of the overall value of the number. To prevent repeating figures that aren’t significant, numbers are often rounded. One must be careful not to lose precision when rounding. Many times the goal of rounding numbers is just to simplify them. Use the rounding calculator to assist with such problems.

## What are the significant figures rules?

To determine what numbers are significant and which aren’t, use the following rules:

- The zero to the left of a decimal value less than
`1`

is not significant. - All trailing zeros that are placeholders are not significant.
- Zeros between non-zero numbers are significant.
- All non-zero numbers are significant.
- If a number has more numbers than the desired number of significant digits, the number is rounded. For example,
`432,500`

is`433,000`

to`3`

significant digits (using half up (regular) rounding). - Zeros at the end of numbers which are not significant but are not removed, as removing would affect the value of the number. In the above example, we cannot remove
`000`

in`433,000`

unless changing the number into scientific notation.