0.000000000751 = 7.51 x 10-10
Since you need to move the decimal point 10 places to the right, the exponent of 10 will be -10. What really you are doing is you are multiplying the given number by 1 represented as 1010/1010 :
0.000000000751 x 1010/1010, where 1/1010 = 10-10.
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It is 8.9*10^-5 in scientific notation
It is: 3.32*10^-3 in scientific notation
It is: 1.95*10^14 in scientific notation
1,000,000 in Scientific Notation = 1 x 106
1,550 in Scientific Notation = 1.55 x 103