I notice that this is a sum of powers of 10, starting from 10^0 which is 1, and ending at 10^5 which is 100,000. I also notice that each power of 10 is 10 times larger than the previous one, so the sum is dominated by the largest term, which is 10^5. To see how much the other terms contribute to the sum, I can divide each term by 10^5 and see how small they are compared to 1. So I get $$\frac{10^0}{10^5} + \frac{10^1}{10^5} + \frac{10^2}{10^5} + \frac{10^3}{10^5} + \frac{10^4}{10^5} + \frac{10^5}{10^5} = 0.00001 + 0.0001 + 0.001 + 0.01 + 0.1 + 1 = 1.11111$$ This means that the sum is very close to 10^5, but slightly larger. Therefore, the closest answer is F) 10^5. 
Which of the following is closest to $$10^0 + 10^1 + 10^2 + 10^3 + 10^4 + 10^5?$$$\bullet$ A) $10^0$

$\bullet$ B) $10^1$

$\bullet$ C) $10^2$

$\bullet$ D) $10^3$

$\bullet$ E) $10^4$

$\bullet$ F) $10^5$

$\bullet$ G) $10^6$

Write your answer as A, B, C, D, E, F, or G.