Which pair corresponds to thousands and thousandths?

Which pair corresponds to thousands and thousandths?

• A. Giga and Nano
• B. G and n
• C. Mega and Micro
• D. Kilo and Milli

Answer: (D)

In SI prefixes, the size of a unit is scaled by powers of ten. Thousands correspond to 10^3, which is expressed with kilo-. Thousandths correspond to 10^-3, which is expressed with milli-. So the pair kilo and milli is the one that matches thousands and thousandths. For context, kilo- means a thousand (as in kilogram, 1,000 grams) and milli- means one thousandth (as in millimeter, 0.001 meter). The other prefixes shown map to different scales—giga and nano to 10^9 and 10^-9, mega and micro to 10^6 and 10^-6—so they don’t describe the specific pair of 10^3 and 10^-3.

In SI prefixes, the size of a unit is scaled by powers of ten. Thousands correspond to 10^3, which is expressed with kilo-. Thousandths correspond to 10^-3, which is expressed with milli-. So the pair kilo and milli is the one that matches thousands and thousandths. For context, kilo- means a thousand (as in kilogram, 1,000 grams) and milli- means one thousandth (as in millimeter, 0.001 meter). The other prefixes shown map to different scales—giga and nano to 10^9 and 10^-9, mega and micro to 10^6 and 10^-6—so they don’t describe the specific pair of 10^3 and 10^-3.