Explanation
To express a number in scientific notation, express it as the product of a number between 1 and 10 and a power of 10. In this case, the number between 1 and 10 is 6.315. In going from 6.315 to 63,150,000,000, you move the decimal point 10 places to the right. Each such move represents a multiplication by 1010 and \(63,150,000,000=6.315 \times 10^{10}\)