If you mean 10 to the power plus 3, the answer is kilo.
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10 + 10 + 10 + 10 + 10 + 10 + 10 + 108 = 178
The prefix micro-, as in micrometre, or microsecond, refers to 10-6, or one millionth, of the whole.
It is kilo-
One method is (10×4)+(5×3) = 55 (or mentally add up from left to right).