Earth is approximately 9.3 × 107 miles from the sun. saturn is approximately 8.87 × 108 miles from the sun. about how much farther is saturn from the sun than earth is?

Both distances are in the scientific notation:
Earth - Sun = 9.3 * 10^7 miles
Saturn - Sun = 8.87 * 10^8 miles
8.87 * 10^8 - 9.3 * 10^7 =
= 88.7 *10^7 - 9.3 * 10^7 =
= 79.4 * 10^7 = 7.94 * 10 ^8 = 794,000,000 miles
Saturn is  7.94 * 10^8 miles farther from Sun than Earth is.