Question

when converting between metric units, it will be necessary to... add or subtract a power of 10. multiply each number by 10. multiply or divide by a power of 10. add 10 to each number.

Explanation:

The metric system is based on powers of 10. When converting between metric units (e.g., meters to kilometers or grams to milligrams), we either multiply (to convert to a smaller unit) or divide (to convert to a larger unit) by a power of 10. Adding/subtracting a power of 10 or adding 10 is incorrect. Multiplying each number by 10 is too limited as different conversions use different powers of 10 (like \(10^3\) for kilo- to base, \(10^{-3}\) for base to milli-). So the correct option is the one about multiplying or dividing by a power of 10.

Answer:

C. multiply or divide by a power of 10. (Assuming the options are labeled A, B, C, D in order, with the third option being C)