# Metric units - general maths

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#1
(I am currently doing A levels and this has nothing to do with them, but: )

Why are there no prefixes in the metric system for units like 10^-4 ?
(or others like -5, or -7)
Last edited by Soni098; 9 months ago
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9 months ago
#2
10^-4 what? Moles? Metres? Elephants?
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#3
(Original post by Deggs_14)
10^-4 what? Moles? Metres? Elephants?
Sorry I wasn't clear enough. Its not to do with what you are quantifying, but more of the names of the prefixes themselves.

You know the way you have prefixes like deci, centi, milli like the ones on the attachment:

Why isn't there a prefix name for numbers like 10^-4? ..etc
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9 months ago
#4
Probably just because it’s not necessary ie you can say 100km or 0.1Mm so there are already enough prefixes that we don’t ever need to use large numbers
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9 months ago
#5
(Original post by Soni098)
(I am currently doing A levels and this has nothing to do with them, but: )

Why are there no prefixes in the metric system for units like 10^-4 ?
(or others like -5, or -7)
That would require too many. Numbers were previously grouped into sets of three digits, e.g. 10,000, so it made sense to have modifiers for each of these groups. 10^x is also quite powerful , and not that much more work than a single letter modifier.
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