8.9x103 to standard notation... 103 = 1000, so you simply multiply the 8.9 by 1000 to give 8900
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89, 97, 101, 103 . . .
In today's notation of Roman numerals 89 = LXXXIX
89 97 101 103.
.89 x 10-6
89% means that you divide a "whole thing" into 100 equal parts and take 89 parts which is the same as the fraction 89/100