Math Prefixes

Tera (T) - 10^12
Giga (G) - 10^9
Mega (M) - 10^6
Kilo (k) - 10^3
Deci (d) - 10^-1
Centi (c) - 10^-2

milli (m) - 10^-3
Micro (µ) - 10^-6 
Nano (n) - 10^-9
Pico (p) - 10^-12

An example: 1 Tm = 10^12 m

The "^" sign means "to the power of". So in sentences, 

1 terameter = 10 to the power of 12 meters.

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This is important for our Emath, one question would probably come out on this, memorise it.