6.42*1021 Scientific notation is written in the form a*10k where a is bigger than one and smaller than 10, and k is an integer. Glad you asked.
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Scientific method.
100,000,000 in scientific notation is: 1.0 × 108
0.00000005 in scientific notation is 5x10^(-8).
71.7 in Scientific Notation = 7.17 x 101
It is: 1.95*10^1 in scientific notation