How do you convert 0.000000000751 into scientific notation?

Answer 1

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.