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

## What are the significant figures rules?

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

1. The zero to the left of a decimal value less than 1 is not significant.
2. All trailing zeros that are placeholders are not significant.
3. Zeros between non-zero numbers are significant.
4. All non-zero numbers are significant.
5. 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).
6. 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.