# How do you write 10^5 in decimal form?

$100000$
A power is a reiterated multiplication. So, ${10}^{5} = 10 \cdot 10 \cdot 10 \cdot 10 \cdot 10$. And as you know, multiplying by $10$ means to add a zero at the end of the number.
This also means that ${10}^{k}$ is simply a one followed by $k$ zeroes.