Which prefix means one millionth?

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Multiple Choice

Which prefix means one millionth?

Explanation:
Understanding metric prefixes helps you scale units by powers of ten. One millionth corresponds to 10^-6, and the prefix that represents that factor is micro, symbol μ. That’s why measurements like microseconds, micrometers, and microamps use this prefix. The other options map to different powers: milli is 10^-3 (one thousandth), nano is 10^-9 (one billionth), and kilo is 10^3 (a thousand). For example, 5 μs equals 5 × 10^-6 seconds, which is 0.000005 seconds.

Understanding metric prefixes helps you scale units by powers of ten. One millionth corresponds to 10^-6, and the prefix that represents that factor is micro, symbol μ. That’s why measurements like microseconds, micrometers, and microamps use this prefix. The other options map to different powers: milli is 10^-3 (one thousandth), nano is 10^-9 (one billionth), and kilo is 10^3 (a thousand). For example, 5 μs equals 5 × 10^-6 seconds, which is 0.000005 seconds.

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