Chemistry Practice Problems Significant Figures Practice Problems Solution: The circumference of Earth through the poles is 40...

# Solution: The circumference of Earth through the poles is 40,008 km. Round this number to four significant figures, and express it in standard exponential notation.

###### Problem

The circumference of Earth through the poles is 40,008 km. Round this number to four significant figures, and express it in standard exponential notation.

###### Solution

We're asked to round off the circumference of Earth which is 40,008 km to four significant figures and to express it in standard exponential notation

Recall that a scientific notation expression is composed of three parts:

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