This is a great introductory activity to half life! Students follow directions on the worksheet to visually reduce a "sample" by half 10 times in a row...and they keep track of the "amount" of the sample at these incremental times...then they graph the data and learn the shape of a half-life graph (exponential decay). They answer questions about the shape of the graph and the concept of half-life, and they conduct a little extra research into the technique of carbon dating and how this activity relates to it.
Please also see my Lucky Leprechaun Half-Life Worksheet
for additional half-life fun!
Thanks for looking!