Question

The radius of earth is 6,370,000m. Express this measurement in km in scientific notation with the correct number of significant digits.

Answer 1

6.37km x 10³ . 6370000m/1000= 6370km then put in scientific notation.

Answer 2

Answer:

$6.3\times10^3 km$

Explanation:

First, convert meters to kilometers:

$6370000m*\frac{1km}{1000m} =6370km$

Now, express it using scientific notation following the next steps:

• The decimal point moves to the left as many spaces until it reaches the right of the first digit.

• The coefficient is written, followed by the multiplication sign.

• Base 10 is written with the exponent equal to the number of spaces that the comma moves.

Therefore:

$6370km=6.3\times 10^3km$