🔍 Key Concepts

• Metric prefixes and their powers of ten • The relationship between words like milli, micro, nano, pico • How many zeros are in a billionth vs a millionth

💭 Think About

• First, recall which common prefix means millionth, and which means thousandth. That lets you rule out at least two options. • Compare the remaining prefixes you know (micro, nano, pico) and think about how they step down by factors of 1,000 (10^3). • Ask yourself: if micro is 10^-6, what comes next when you go three more decimal places smaller?

✅ Before You Answer

• Be clear on milli = 10^-3 and micro = 10^-6 before you choose. • Check that your choice for nano fits into the sequence: milli, micro, nano, pico, each changing by a factor of 10^3. • Verify that the power of ten you pick corresponds to the correct verbal name (thousandth, millionth, billionth, or trillionth).