1. Which of the following has the largest value?

A $1-0.1$
B $1-0.01$
C $1-0.001$
D $1-0.0001$
E $1-0.00001$
Solution: $\mathbf{E}$
In each case a number is subtracted from 1 . The smaller the number we subtract, the larger the answer will be. So the largest value is obtained when the smallest number is subtracted.