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What is a prefix? Give some common prefixes for multiples and submultiples.

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Prefix is used to increase or decrease the value of a fundamental or derived unit as per practical requirements

Multiples Submultiples
Exa(a) = 1018 atto(a) = 10-18
Peta(P) = 1015 femto(f) = 10-15
Tera(t) = 1012 pico(P) = 10-12
Giga(G) = 109 nano(n) = 10-9
Mega(M) = 106 micro(μ) = 10-6
Kilo(k) = 103 milli(m) = 10-3
Hecto(h) = 102 centi(c) = 10-2
Deca(da) = 101 deci(d) = 10-1

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