If you mean: 3.45*10^7 and 6.25*10^5 then they are already in scientific notation and they represent the numbers 34,500,000 and 625,000 respectively
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Yes, scientific notation can be negative. For example -345 would be -3.45 x 102.
3.45 x 10^4
As a decimal: 345.0 As an improper fraction: 345/1 In scientific notation: 3.45*10^2
345*100 (3.45*10^2)*(10^2) 3.45*10^4
345 x 10-6 l