1. The problem asks to convert the number 100000 to its negative standard form. 2. Negative standard form means expressing the number as a negative number in scientific notation. 3. Scientific notation expresses a number as $a \times 10^n$ where $1 \leq |a| < 10$ and $n$ is an integer. 4. First, write 100000 in scientific notation: $$100000 = 1.0 \times 10^5$$ 5. To convert to negative standard form, simply make the coefficient negative: $$-1.0 \times 10^5$$ 6. Therefore, the negative standard form of 100000 is $$-1.0 \times 10^5$$.