The mass of a freight train is 9.98 ⋅ 106 kilograms. The mass of an aircraft carrier is 7.3 ⋅ 107 kilograms. Approximately how many more kilograms is the mass of an aircraft carrier than the mass of a freight train? Show your work and write your answer in scientific notation.

To get the difference of how many more kg the aircraft carrier has than the freight train you need to make both scientific notations of the masses the same. We will make both exponents into 10^5 so, the mass of the aircraft carrier is 7.3 x 10^7 or 730 x 10^5 while the mass of the freight train is 9.98 x 10^6 or 99.8 x 10^5. Knowing the exponent will be 10^5, simply subtract 730 with 99.8 = 630.2. The answer is 630.2 x 10^5.