Consider the following example: 28 x 46 x 320 In the GMAT it is important to identify the difference between the base and the exponent. The bases in the above example are the 2, 3 and 4. The exponents are the 6, 8 and 20. A basic rule is to make the bases the same or make the exponents the same. If I had to choose, I’d rather make the bases the same, as the question usually becomes easier this way.
Simplifying GMAT Exponent Questions | Economist GMAT Tutor