Hundred

$100 = 10^2$. Madachy (1979) gives a number of algebraic equations using the digits 1 to 9 which evaluate to 100, such as

$$\begin{eqnarray*} (7-5)^2+96+8-4-3-1&=&100\\ 3^2+91+7+8-6-5-4&=&100\\ \sqrt{9}-6+72-(1)(3!)-8+45&=&100\\ 123-45-67+89&=&100, \end{eqnarray*}$$

and so on.

See also 10, Billion, Hundred, Large Number, Million, Thousand

References

Madachy, J. S. Madachy's Mathematical Recreations. New York: Dover, pp. 156-159, 1979.