15 * 15 * 15 * 500 = 1,687,500. it's different from finding 45 * 500 because 15 * 15* 15 * 500 is the same as writing it as 15^3 * 500. This meaning you multiply the number 15 by itself 3 times, not add it 3 times, which is what 45 * 500 was showing. I hope this helped.
