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Five billionths in scientific notation is: 5 x 10^-9
two hundred ten billionths in scientific notation is 2.10 x 10^-8
700 m in Scientific Notation = 7 x 102m
If you mean: 20/1,000,000,000 then it is 2.0*10^-8
Yes, because 700 is bigger than 400 and both have the same denominator, in billionths