Every year from 1968 until 1999, I posed the following challenge to my students:

Write expressions for all the numbers from 1 to 100 using only the digits in the current year in order and using the operations +, -, x, ÷, ^ (raised to a power), sqrt (square root), and ! (factorial), along with grouping symbols.

I presented the problem before the winter vacation, and many of my students would return in January with expressions completed for most of the numbers (and some had finished all of them!).

Click here for a worksheet for the year 2005 (From The Math Forum)