Science quiz
SI prefixes in order
Twenty four prefixes scale the metric system up and down. Each row shows a power of ten; type the prefix that goes with it.
- Format
- Type them all
- Items
- 24 answers
- Limit
- 5:00
- Level
- Hard
- Checked
- 2026.10.03
- Answers
- 24
- Time limit
- 5:00
- Order
- Any order
- Matching
- Case and accents ignored
- Type an answer; it files itself the moment it matches.
- One answer can fill several slots.
- Give up at any time to see what you missed.
- Pause whenever you like (Esc). The board hides while the clock is stopped.
Name the SI prefix for each power of ten.
| Factor | Prefix | Symbol |
|---|---|---|
| 10³⁰ | Not found yet | |
| 10²⁷ | Not found yet | |
| 10²⁴ | Not found yet | |
| 10²¹ | Not found yet | |
| 10¹⁸ | Not found yet | |
| 10¹⁵ | Not found yet | |
| 10¹² | Not found yet | |
| 10⁹ | Not found yet | |
| 10⁶ | Not found yet | |
| 10³ | Not found yet | |
| 10² | Not found yet | |
| 10¹ | Not found yet |
| Factor | Prefix | Symbol |
|---|---|---|
| 10⁻¹ | Not found yet | |
| 10⁻² | Not found yet | |
| 10⁻³ | Not found yet | |
| 10⁻⁶ | Not found yet | |
| 10⁻⁹ | Not found yet | |
| 10⁻¹² | Not found yet | |
| 10⁻¹⁵ | Not found yet | |
| 10⁻¹⁸ | Not found yet | |
| 10⁻²¹ | Not found yet | |
| 10⁻²⁴ | Not found yet | |
| 10⁻²⁷ | Not found yet | |
| 10⁻³⁰ | Not found yet |
About this quiz
SI prefixes multiply a unit by a power of ten, so a kilometre is 10³ metres and a nanosecond is 10⁻⁹ seconds. There are 24 of them, twelve for multiples and twelve for fractions.
- The four newest prefixes, quetta, ronna, ronto and quecto, were added in 2022.
- Symbols for the large prefixes from mega upwards are capital letters; kilo, hecto and deca are lower case.
- Beyond 10³ and 10⁻³ the prefixes go up and down in steps of a thousand.
Sources
- [1]BIPM. SI prefixes.
Note on the data. Names, symbols and factors follow the International Bureau of Weights and Measures table of SI prefixes, checked on 3 October 2026. The American spelling deka is accepted for deca.
Last checked October 3, 2026
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