300000000 = 3×10^8
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It is: 3.0*108
300000000 (8 zeros) = 300,000,000 m = 3.0 x 108 m = 3.0 x 105 km
300000000 m/s = 3 × 10^8 m/s c ≈ 2.99792458 m/s = 2.99792458 × 10^8 m/s which is usually rounded to 3 × 10^8 m/s
It is 8.9*10^-5 in scientific notation
It is "(scientific notation)".